diff --git a/codeforces/855/1800d.cc b/codeforces/1054/d.cc
similarity index 67%
rename from codeforces/855/1800d.cc
rename to codeforces/1054/d.cc
index 3968628..861bf8e 100644
--- a/codeforces/855/1800d.cc
+++ b/codeforces/1054/d.cc
@@ -39,14 +39,34 @@ template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
 //  }}}
 
 void solve() {
-  int n;
-  cin >> n;
+  u32 n;
   string s;
-  cin >> s;
-  int ans = n - 1;
-  for (int i = 0; i < n - 2; ++i) {
-    ans -= s[i] == s[i + 2];
-  }
+  cin >> n >> s;
+
+  u64 ans = MAX<u64>;
+
+  auto f = [&](string &t) {
+    vector<u64> pos;
+    for (u64 i = 0; i < n; i++)
+      if (t[i] == 'a')
+        pos.push_back(i);
+    u64 m = pos.size();
+
+    vector<u64> pref(m + 1), suff(m + 1);
+    for (u64 i = 0; i < m; i++)
+      pref[i + 1] = pref[i] + pos[i] - i;
+    for (u64 i = m; i--;)
+      suff[i] = suff[i + 1] + (n - (m - i)) - pos[i];
+
+    for (u64 i = 0; i <= m; i++)
+      ans = min<u64>(ans, pref[i] + suff[i]);
+  };
+
+  f(s);
+  transform(s.begin(), s.end(), s.begin(),
+            [](char c) { return c ^ 'a' ^ 'b'; });
+  f(s);
+
   cout << ans << '\n';
 }
 
diff --git a/codeforces/1054/io/2149a.cpin b/codeforces/1054/io/2149a.cpin
new file mode 100644
index 0000000..8332666
--- /dev/null
+++ b/codeforces/1054/io/2149a.cpin
@@ -0,0 +1,11 @@
+5
+4
+abab
+6
+bababa
+7
+abababa
+2
+ab
+1
+b
diff --git a/codeforces/1054/io/d.1.cpin b/codeforces/1054/io/d.1.cpin
new file mode 100644
index 0000000..8332666
--- /dev/null
+++ b/codeforces/1054/io/d.1.cpin
@@ -0,0 +1,11 @@
+5
+4
+abab
+6
+bababa
+7
+abababa
+2
+ab
+1
+b
diff --git a/codeforces/855/1800a.cc b/codeforces/855/1800a.cc
deleted file mode 100644
index ac88e9c..0000000
--- a/codeforces/855/1800a.cc
+++ /dev/null
@@ -1,86 +0,0 @@
-#include <bits/stdc++.h> // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-constexpr string meow{"meow"};
-
-void solve() {
-  u32 n;
-  cin >> n;
-  string s;
-  cin >> s;
-
-  u32 i = 0, j = 0;
-
-  while (j < meow.size() && i < n && tolower(s[i]) == meow[j]) {
-    while (i < n && tolower(s[i]) == meow[j])
-      ++i;
-    ++j;
-  }
-
-  if (i == n && j == meow.size()) {
-    cout << "YES";
-  } else {
-    cout << "NO";
-  }
-
-  cout << '\n';
-}
-
-int main() { // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800b.cc b/codeforces/855/1800b.cc
deleted file mode 100644
index c51eb50..0000000
--- a/codeforces/855/1800b.cc
+++ /dev/null
@@ -1,89 +0,0 @@
-#include <bits/stdc++.h> // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-void solve() {
-  u32 n, k;
-  cin >> n >> k;
-  string s;
-  cin >> s;
-  vector<i32> f(26, 0);
-
-  u32 ans = 0;
-  for (auto letter : s) {
-    if (isupper(letter)) {
-      if (f[letter - 'a']++ < 0) {
-        ++ans;
-      }
-    } else {
-      if (f[letter]-- > 0) {
-        ++ans;
-      }
-    }
-  }
-
-  u32 matches = 0;
-  // for (auto freq : f) {
-  //   matches += freq / 2;
-  // }
-
-  cout << ans + min(k, matches) << '\n';
-}
-
-int main() { // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800c1.cc b/codeforces/855/1800c1.cc
deleted file mode 100644
index ec154da..0000000
--- a/codeforces/855/1800c1.cc
+++ /dev/null
@@ -1,66 +0,0 @@
-#include <bits/stdc++.h>  // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T>
-constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T>
-constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-void solve() {
-}
-
-int main() {  // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800c2.cc b/codeforces/855/1800c2.cc
deleted file mode 100644
index a59d150..0000000
--- a/codeforces/855/1800c2.cc
+++ /dev/null
@@ -1,67 +0,0 @@
-#include <bits/stdc++.h>  // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T>
-constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T>
-constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-void solve() {
-  
-}
-
-int main() {  // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800e1.cc b/codeforces/855/1800e1.cc
deleted file mode 100644
index a59d150..0000000
--- a/codeforces/855/1800e1.cc
+++ /dev/null
@@ -1,67 +0,0 @@
-#include <bits/stdc++.h>  // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T>
-constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T>
-constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-void solve() {
-  
-}
-
-int main() {  // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800e2.cc b/codeforces/855/1800e2.cc
deleted file mode 100644
index 117401d..0000000
--- a/codeforces/855/1800e2.cc
+++ /dev/null
@@ -1,95 +0,0 @@
-#include <bits/stdc++.h> // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-bitset<2 * 100000> seen;
-void solve() {
-  seen.reset();
-  u32 n, k;
-  cin >> n >> k;
-  string s, t;
-  cin >> s >> t;
-
-  u32 ans = 0;
-  vector<u32> f(26, 0);
-
-  auto dfs = [&](auto &&self, i32 i) -> void {
-    if (i < 0 || i >= n || seen[i])
-      return;
-    seen[i] = true;
-    ++f[s[i] - 'a'];
-    --f[t[i] - 'a'];
-    for (auto d : {i - k, i - k - 1, i + k, i + k + 1}) {
-      self(self, d);
-    }
-  };
-
-  bool ok = true;
-  for (i32 i = 0; i < n && ok; ++i) {
-    if (!seen[i]) {
-      dfs(dfs, i);
-      ok &= count(f.begin(), f.end(), 0) == 26;
-      f.assign(26, 0);
-    }
-  }
-
-  cout << (ok ? "YES" : "NO") << '\n';
-}
-
-int main() { // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800f.cc b/codeforces/855/1800f.cc
deleted file mode 100644
index 3ce0dca..0000000
--- a/codeforces/855/1800f.cc
+++ /dev/null
@@ -1,94 +0,0 @@
-#include <bits/stdc++.h> // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-vector<u32> parities(200000, 0);
-vector<bitset<32>> present(200000);
-
-void solve() {
-  u32 n;
-  cin >> n;
-
-  string s;
-  for (u32 i = 0; i < n; ++i) {
-    cin >> s;
-    for (auto c : s) {
-      parities[i] ^= 1 << (c - 'a');
-      present[i].set(c - 'a');
-    }
-  }
-
-  u64 ans = 0;
-  unordered_map<u32, u64> f;
-
-  for (u32 c = 0; c < 26; ++c) {
-    u32 mask = ((1 << 26) - 1) ^ (1 << c);
-    for (u32 i = 0; i < n; i++) {
-      if (present[i].test(c))
-        continue;
-      ans += f[parities[i] ^ mask];
-      ++f[parities[i]];
-    }
-    f.clear();
-  }
-
-  cout << ans << '\n';
-}
-
-int main() { // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  // std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/1800g.cc b/codeforces/855/1800g.cc
deleted file mode 100644
index a59d150..0000000
--- a/codeforces/855/1800g.cc
+++ /dev/null
@@ -1,67 +0,0 @@
-#include <bits/stdc++.h>  // {{{
-
-#include <version>
-#ifdef __cpp_lib_ranges_enumerate
-#include <ranges>
-namespace rv = std::views;
-namespace rs = std::ranges;
-#endif
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-using i16 = int16_t;
-using u16 = uint16_t;
-using i32 = int32_t;
-using u32 = uint32_t;
-using i64 = int64_t;
-using u64 = uint64_t;
-using f64 = double;
-using f128 = long double;
-
-#if __cplusplus >= 202002L
-template <typename T>
-constexpr T MIN = std::numeric_limits<T>::min();
-
-template <typename T>
-constexpr T MAX = std::numeric_limits<T>::max();
-#endif
-
-#ifdef LOCAL
-#define db(...) std::print(__VA_ARGS__)
-#define dbln(...) std::println(__VA_ARGS__)
-#else
-#define db(...)
-#define dbln(...)
-#endif
-//  }}}
-
-void solve() {
-  
-}
-
-int main() {  // {{{
-  std::cin.exceptions(std::cin.failbit);
-
-#ifdef LOCAL
-  std::cerr.rdbuf(std::cout.rdbuf());
-  std::cout.setf(std::ios::unitbuf);
-  std::cerr.setf(std::ios::unitbuf);
-#else
-  std::cin.tie(nullptr)->sync_with_stdio(false);
-#endif
-
-  u32 tc = 1;
-  std::cin >> tc;
-
-  for (u32 t = 0; t < tc; ++t) {
-    solve();
-  }
-
-  return 0;
-}
-// }}}
diff --git a/codeforces/855/io/1800a.1.cpin b/codeforces/855/io/1800a.1.cpin
deleted file mode 100644
index 3a194d3..0000000
--- a/codeforces/855/io/1800a.1.cpin
+++ /dev/null
@@ -1,15 +0,0 @@
-7
-4
-meOw
-14
-mMmeoOoWWWwwwW
-3
-mew
-7
-MmeEeUw
-4
-MEOW
-6
-MmyaVW
-5
-meowA
diff --git a/codeforces/855/io/1800a.1.cpout b/codeforces/855/io/1800a.1.cpout
deleted file mode 100644
index 222b3f9..0000000
--- a/codeforces/855/io/1800a.1.cpout
+++ /dev/null
@@ -1,7 +0,0 @@
-YES
-YES
-NO
-NO
-YES
-NO
-NO
diff --git a/codeforces/855/io/1800b.1.cpin b/codeforces/855/io/1800b.1.cpin
deleted file mode 100644
index 5edeb84..0000000
--- a/codeforces/855/io/1800b.1.cpin
+++ /dev/null
@@ -1,11 +0,0 @@
-5
-11 2
-aAaaBACacbE
-2 2
-ab
-4 1
-aaBB
-6 0
-abBAcC
-5 3
-cbccb
diff --git a/codeforces/855/io/1800b.1.cpout b/codeforces/855/io/1800b.1.cpout
deleted file mode 100644
index bf5057a..0000000
--- a/codeforces/855/io/1800b.1.cpout
+++ /dev/null
@@ -1,5 +0,0 @@
-5
-0
-1
-3
-2
diff --git a/codeforces/855/io/1800c1.1.cpin b/codeforces/855/io/1800c1.1.cpin
deleted file mode 100644
index d850bc4..0000000
--- a/codeforces/855/io/1800c1.1.cpin
+++ /dev/null
@@ -1,11 +0,0 @@
-5
-5
-3 3 3 0 0
-6
-0 3 3 0 0 3
-7
-1 2 3 0 4 5 0
-7
-1 2 5 0 4 3 0
-5
-3 1 0 0 4
diff --git a/codeforces/855/io/1800c1.1.cpout b/codeforces/855/io/1800c1.1.cpout
deleted file mode 100644
index 26aa2ea..0000000
--- a/codeforces/855/io/1800c1.1.cpout
+++ /dev/null
@@ -1,5 +0,0 @@
-6
-6
-8
-9
-4
diff --git a/codeforces/855/io/1800c2.1.cpin b/codeforces/855/io/1800c2.1.cpin
deleted file mode 100644
index d850bc4..0000000
--- a/codeforces/855/io/1800c2.1.cpin
+++ /dev/null
@@ -1,11 +0,0 @@
-5
-5
-3 3 3 0 0
-6
-0 3 3 0 0 3
-7
-1 2 3 0 4 5 0
-7
-1 2 5 0 4 3 0
-5
-3 1 0 0 4
diff --git a/codeforces/855/io/1800c2.1.cpout b/codeforces/855/io/1800c2.1.cpout
deleted file mode 100644
index 26aa2ea..0000000
--- a/codeforces/855/io/1800c2.1.cpout
+++ /dev/null
@@ -1,5 +0,0 @@
-6
-6
-8
-9
-4
diff --git a/codeforces/855/io/1800d.1.cpin b/codeforces/855/io/1800d.1.cpin
deleted file mode 100644
index cd6670e..0000000
--- a/codeforces/855/io/1800d.1.cpin
+++ /dev/null
@@ -1,15 +0,0 @@
-7
-6
-aaabcc
-10
-aaaaaaaaaa
-6
-abcdef
-7
-abacaba
-6
-cccfff
-4
-abba
-5
-ababa
diff --git a/codeforces/855/io/1800d.1.cpout b/codeforces/855/io/1800d.1.cpout
deleted file mode 100644
index 78452a0..0000000
--- a/codeforces/855/io/1800d.1.cpout
+++ /dev/null
@@ -1,7 +0,0 @@
-4
-1
-5
-3
-3
-3
-1
diff --git a/codeforces/855/io/1800e1.1.cpin b/codeforces/855/io/1800e1.1.cpin
deleted file mode 100644
index 50c15a4..0000000
--- a/codeforces/855/io/1800e1.1.cpin
+++ /dev/null
@@ -1,22 +0,0 @@
-7
-6 3
-talant
-atltna
-7 3
-abacaba
-aaaabbc
-12 3
-abracadabraa
-avadakedavra
-5 3
-accio
-cicao
-5 3
-lumos
-molus
-4 3
-uwjt
-twju
-4 3
-kvpx
-vxpk
diff --git a/codeforces/855/io/1800e1.1.cpout b/codeforces/855/io/1800e1.1.cpout
deleted file mode 100644
index 5b1cfa6..0000000
--- a/codeforces/855/io/1800e1.1.cpout
+++ /dev/null
@@ -1,7 +0,0 @@
-YES
-YES
-NO
-YES
-NO
-YES
-NO
diff --git a/codeforces/855/io/1800e2.1.cpin b/codeforces/855/io/1800e2.1.cpin
deleted file mode 100644
index 0d27b05..0000000
--- a/codeforces/855/io/1800e2.1.cpin
+++ /dev/null
@@ -1,22 +0,0 @@
-7
-6 3
-talant
-atltna
-7 1
-abacaba
-aaaabbc
-12 6
-abracadabraa
-avadakedavra
-5 3
-accio
-cicao
-5 4
-lumos
-molus
-4 3
-uwjt
-twju
-4 3
-kvpx
-vxpk
diff --git a/codeforces/855/io/1800e2.1.cpout b/codeforces/855/io/1800e2.1.cpout
deleted file mode 100644
index 5b1cfa6..0000000
--- a/codeforces/855/io/1800e2.1.cpout
+++ /dev/null
@@ -1,7 +0,0 @@
-YES
-YES
-NO
-YES
-NO
-YES
-NO
diff --git a/codeforces/855/io/1800f.1.cpin b/codeforces/855/io/1800f.1.cpin
deleted file mode 100644
index 79618aa..0000000
--- a/codeforces/855/io/1800f.1.cpin
+++ /dev/null
@@ -1,11 +0,0 @@
-10
-ftl
-abcdefghijklmnopqrstuvwxy
-abcdeffghijkllmnopqrsttuvwxy
-ffftl
-aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyy
-thedevid
-bcdefghhiiiijklmnopqrsuwxyz
-gorillasilverback
-abcdefg
-ijklmnopqrstuvwxyz
diff --git a/codeforces/855/io/1800f.1.cpout b/codeforces/855/io/1800f.1.cpout
deleted file mode 100644
index 7ed6ff8..0000000
--- a/codeforces/855/io/1800f.1.cpout
+++ /dev/null
@@ -1 +0,0 @@
-5
diff --git a/codeforces/855/io/1800g.1.cpin b/codeforces/855/io/1800g.1.cpin
deleted file mode 100644
index 32df116..0000000
--- a/codeforces/855/io/1800g.1.cpin
+++ /dev/null
@@ -1,44 +0,0 @@
-6
-6
-1 5
-1 6
-1 2
-2 3
-2 4
-7
-1 5
-1 3
-3 6
-1 4
-4 7
-4 2
-9
-1 2
-2 4
-2 3
-3 5
-1 7
-7 6
-7 8
-8 9
-10
-2 9
-9 10
-2 3
-6 7
-4 3
-1 2
-3 8
-2 5
-6 5
-10
-3 2
-8 10
-9 7
-4 2
-8 2
-2 1
-4 5
-6 5
-5 7
-1
diff --git a/codeforces/855/io/1800g.1.cpout b/codeforces/855/io/1800g.1.cpout
deleted file mode 100644
index 3569a3e..0000000
--- a/codeforces/855/io/1800g.1.cpout
+++ /dev/null
@@ -1,6 +0,0 @@
-YES
-NO
-YES
-NO
-NO
-YES
diff --git a/leetcode/.clang-format b/leetcode/.clang-format
deleted file mode 100644
index 5625628..0000000
--- a/leetcode/.clang-format
+++ /dev/null
@@ -1,2 +0,0 @@
-BasedOnStyle: Google
-AllowShortFunctionsOnASingleLine: Empty
diff --git a/leetcode/a.cc b/leetcode/a.cc
deleted file mode 100644
index b1ed3ac..0000000
--- a/leetcode/a.cc
+++ /dev/null
@@ -1,268 +0,0 @@
-#include <bits/stdc++.h>
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-template <typename... Args>
-void print(std::string const &str, Args &&...args) {
-  std::cout << std::vformat(
-      str,
-      // make_format_args binds arguments to const
-      std::make_format_args(static_cast<Args const &>(args)...));
-}
-
-template <typename T>
-void print(T const &t) {
-  std::cout << t;
-}
-
-template <std::ranges::range T>
-void print(T const &t) {
-  if constexpr (std::is_convertible_v<T, char const *>) {
-    std::cout << t;
-  } else {
-    for (auto const &e : t) {
-      std::cout << e << ' ';
-    }
-  }
-}
-
-template <typename... Args>
-void println(std::string const &str, Args &&...args) {
-  print(str, std::forward<Args>(args)...);
-  cout << '\n';
-}
-
-void println() {
-  std::cout << '\n';
-}
-
-template <typename T>
-void println(T const &t) {
-  print(t);
-  println();
-}
-
-template <std::ranges::range T>
-void println(T const &t) {
-  print(t);
-  println();
-}
-
-template <typename T>
-T MAX() {
-  return std::numeric_limits<T>::max();
-}
-
-template <typename T>
-T MIN() {
-  return std::numeric_limits<T>::min();
-}
-
-#define ff first
-#define ss second
-#define eb emplace_back
-#define ll long long
-#define ld long double
-#define vec vector
-
-#define all(x) (x).begin(), (x).end()
-#define rall(x) (r).rbegin(), (x).rend()
-#define sz(x) static_cast<int>((x).size())
-#define FOR(a, b, c) for (int a = b; a < c; ++a)
-
-mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
-#define randint(a, b) uniform_int_distribution(a, b)(rng)
-
-void YES() {
-  cout << "YES\n";
-}
-void NO() {
-  cout << "NO\n";
-}
-
-#ifdef LOCAL
-#define dbg(x) cout << __LINE__ << ": " << #x << "=<" << (x) << ">\n";
-#else
-#define dbg(x)
-#endif
-
-static constexpr int MOD = 1e9 + 7;
-
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-
-using namespace __gnu_pbds;
-
-// https://mirror.codeforces.com/blog/entry/124683
-
-namespace hashing {
-using i64 = std::int64_t;
-using u64 = std::uint64_t;
-static const u64 FIXED_RANDOM =
-    std::chrono::steady_clock::now().time_since_epoch().count();
-
-#if USE_AES
-std::mt19937 rd(FIXED_RANDOM);
-const __m128i KEY1{(i64)rd(), (i64)rd()};
-const __m128i KEY2{(i64)rd(), (i64)rd()};
-#endif
-
-template <class T, class D = void>
-struct custom_hash {};
-
-template <class T>
-inline void hash_combine(u64 &seed, T const &v) {
-  custom_hash<T> hasher;
-  seed ^= hasher(v) + 0x9e3779b97f4a7c15 + (seed << 12) + (seed >> 4);
-};
-
-template <class T>
-struct custom_hash<T,
-                   typename std::enable_if<std::is_integral<T>::value>::type> {
-  u64 operator()(T _x) const {
-    u64 x = _x;
-#if USE_AES
-    __m128i m{i64(u64(x) * 0xbf58476d1ce4e5b9u64), (i64)FIXED_RANDOM};
-    __m128i y = _mm_aesenc_si128(m, KEY1);
-    __m128i z = _mm_aesenc_si128(y, KEY2);
-    return z[0];
-#else
-    x += 0x9e3779b97f4a7c15 + FIXED_RANDOM;
-    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
-    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
-    return x ^ (x >> 31);
-#endif
-  }
-};
-
-template <class T>
-struct custom_hash<T, std::void_t<decltype(std::begin(std::declval<T>()))>> {
-  u64 operator()(T const &a) const {
-    u64 value = FIXED_RANDOM;
-    for (auto &x : a) hash_combine(value, x);
-    return value;
-  }
-};
-
-template <class... T>
-struct custom_hash<std::tuple<T...>> {
-  u64 operator()(const std::tuple<T...> &a) const {
-    u64 value = FIXED_RANDOM;
-    std::apply([&value](T const &...args) { (hash_combine(value, args), ...); },
-               a);
-    return value;
-  }
-};
-
-template <class T, class U>
-struct custom_hash<std::pair<T, U>> {
-  u64 operator()(std::pair<T, U> const &a) const {
-    u64 value = FIXED_RANDOM;
-    hash_combine(value, a.first);
-    hash_combine(value, a.second);
-    return value;
-  }
-};
-};  // namespace hashing
-
-#ifdef PB_DS_ASSOC_CNTNR_HPP
-template <class Key, class Value>
-using hashmap = gp_hash_table<
-    Key, Value, hashing::custom_hash<Key>, std::equal_to<Key>,
-    direct_mask_range_hashing<>, linear_probe_fn<>,
-    hash_standard_resize_policy<hash_exponential_size_policy<>,
-                                hash_load_check_resize_trigger<>, true>>;
-template <class Key>
-using hashset = gp_hash_table<
-    Key, null_type, hashing::custom_hash<Key>, std::equal_to<Key>,
-    direct_mask_range_hashing<>, linear_probe_fn<>,
-    hash_standard_resize_policy<hash_exponential_size_policy<>,
-                                hash_load_check_resize_trigger<>, true>>;
-
-#endif
-#ifdef PB_DS_TREE_POLICY_HPP
-template <typename T>
-using multiset = tree<T, null_type, std::less_equal<T>, rb_tree_tag,
-                      tree_order_statistics_node_update>;
-template <class Key, class Value = null_type>
-using rbtree = tree<Key, Value, std::less<Key>, rb_tree_tag,
-                    tree_order_statistics_node_update>;
-#endif
-
-const vec<pair<int, int>> dirs = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
-
-constexpr int RIGHT = 1, LEFT = 2, DOWN = 3, UP = 4;
-
-void solve() {
-  int m, n;
-  cin >> m >> n;
-
-  vec<vec<int>> grid(m, vec<int>(n, 0));
-
-  for (auto &row : grid) {
-    for (auto &cell : row) {
-      cin >> cell;
-    }
-  }
-
-  deque<tuple<int, int, int>> q{{0, 0, 0}};
-
-  hashset<pair<int, int>> seen;
-
-  while (!q.empty()) {
-    auto [r, c, w] = q.front();
-    q.pop_front();
-
-    println("at r={}, c={}, w={}", r, c, w);
-
-    if (min(r, c) < 0 || r == m || c == n) continue;
-
-    if (r == m - 1 && c == n - 1) {
-      println(w);
-      return;
-    }
-
-    if (seen.find({r, c}) != seen.end()) continue;
-
-    seen.insert({r, c});
-
-    switch (grid[r][c]) {
-      case UP:
-        q.emplace_front(r - 1, c, w);
-        break;
-      case LEFT:
-        q.emplace_front(r, c - 1, w);
-        break;
-      case DOWN:
-        q.emplace_front(r + 1, c, w);
-        break;
-      case RIGHT:
-        q.emplace_front(r, c + 1, w);
-        break;
-    }
-
-    for (auto &[dr, dc] : dirs) {
-      int nr = r + dr, nc = c + dc;
-
-      q.emplace_back(nr, nc, w + 1);
-    }
-  }
-}
-
-int main() {
-  cin.tie(nullptr)->sync_with_stdio(false);
-
-  int t = 1;
-  cin >> t;
-
-  while (t--) {
-    solve();
-  }
-
-  return 0;
-}
diff --git a/leetcode/a.in b/leetcode/a.in
deleted file mode 100644
index aca90a1..0000000
--- a/leetcode/a.in
+++ /dev/null
@@ -1,7 +0,0 @@
-3
-4 4
-1 1 1 1 2 2 2 2 1 1 1 1 2 2 2 2
-3 3
-1 1 3 3 2 2 1 1 4
-2 2
-1 2 4 3
diff --git a/leetcode/b.cc b/leetcode/b.cc
deleted file mode 100644
index 7aa6310..0000000
--- a/leetcode/b.cc
+++ /dev/null
@@ -1,110 +0,0 @@
-#include <bits/stdc++.h>
-
-// https://codeforces.com/blog/entry/96344
-
-#pragma GCC optimize("O2,unroll-loops")
-#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
-
-using namespace std;
-
-template <typename... Args>
-void print(std::string const &str, Args &&...args) {
-  std::cout << std::vformat(
-      str,
-      // make_format_args binds arguments to const
-      str, std::make_format_args(static_cast<Args const &>(args)...));
-}
-
-template <typename T>
-void print(T const &t) {
-  std::cout << t;
-}
-
-template <std::ranges::range T>
-void print(T const &t) {
-  if constexpr (std::is_convertible_v<T, char const *>) {
-    std::cout << t << '\n';
-  } else {
-    for (auto const &e : t) {
-      std::cout << e << ' ';
-    }
-    std::cout << '\n';
-  }
-}
-
-template <typename... Args>
-void println(std::string const &str, Args &&...args) {
-  print(str, std::forward<Args>(args)...);
-  cout << '\n';
-}
-
-template <typename T>
-void println(T const &t) {
-  print("{}\n", t);
-}
-
-template <std::ranges::range T>
-void println(T const &t) {
-  cout << t << '\n';
-}
-
-void println() {
-  std::cout << '\n';
-}
-
-template <typename T>
-T MAX() {
-  return std::numeric_limits<T>::max();
-}
-
-template <typename T>
-T MIN() {
-  return std::numeric_limits<T>::min();
-}
-
-#define ff first
-#define ss second
-#define eb emplace_back
-#define ll long long
-#define ld long double
-#define vec vector
-
-#define all(x) (x).begin(), (x).end()
-#define rall(x) (r).rbegin(), (x).rend()
-#define sz(x) static_cast<int>((x).size())
-#define FOR(a, b, c) for (int a = b; a < c; ++a)
-
-mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
-#define randint(a, b) uniform_int_distribution(a, b)(rng)
-
-void YES() {
-  cout << "YES\n";
-}
-void NO() {
-  cout << "NO\n";
-}
-
-#ifdef LOCAL
-#define dbg(x) cout << __LINE__ << ": " << #x << "=<" << (x) << ">\n";
-#else
-#define dbg(x)
-#endif
-
-static constexpr int MOD = 1e9 + 7;
-
-void solve() {
-  
-}
-
-int main() {
-  cin.tie(nullptr)->sync_with_stdio(false);
-
-  int t = 1;
-  cin >> t;
-
-  while (t--) {
-      solve();
-  }
-
-  return 0;
-}
diff --git a/leetcode/b.in b/leetcode/b.in
deleted file mode 100644
index e69de29..0000000
diff --git a/leetcode/b.out b/leetcode/b.out
deleted file mode 100644
index e69de29..0000000
diff --git a/leetcode/compile_flags.txt b/leetcode/compile_flags.txt
deleted file mode 100644
index ebd5be8..0000000
--- a/leetcode/compile_flags.txt
+++ /dev/null
@@ -1,5 +0,0 @@
--std=c++20
--Wall
--Wextra
--Wshadow
--DLOCAL