diff --git a/codeforces/826/1741a.cc b/codeforces/826/1741a.cc
new file mode 100644
index 0000000..fb1981a
--- /dev/null
+++ b/codeforces/826/1741a.cc
@@ -0,0 +1,93 @@
+#include <bits/stdc++.h> // {{{
+
+#include <version>
+#ifdef __cpp_lib_ranges_enumerate
+#include <ranges>
+namespace rv = std::views;
+namespace rs = std::ranges;
+#endif
+
+#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() {
+  string a, b;
+  cin >> a >> b;
+
+  u32 i = 0, j = 0;
+
+  while (i < a.size() && j < b.size()) {
+    u32 a_xs = 0, b_xs = 0;
+    while (a[i] == 'X') {
+      ++a_xs;
+      ++i;
+    }
+    while (b[j] == 'X') {
+      ++b_xs;
+      ++j;
+    }
+
+    if (a[i] == b[j]) {
+      if (a_xs != b_xs) {
+        cout << ((a[i] == 'S' && a_xs < b_xs || a[i] == 'L' && a_xs > b_xs)
+                     ? '>'
+                     : '<')
+             << '\n';
+        return;
+      }
+    } else {
+      cout << ((a[i] == 'S' || a[i] == 'M' && b[j] == 'L') ? '<' : '>') << '\n';
+      return;
+    }
+
+    ++i;
+    ++j;
+  }
+
+  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/826/1741b.cc b/codeforces/826/1741b.cc
new file mode 100644
index 0000000..8ea6c79
--- /dev/null
+++ b/codeforces/826/1741b.cc
@@ -0,0 +1,75 @@
+#include <bits/stdc++.h> // {{{
+
+#include <version>
+#ifdef __cpp_lib_ranges_enumerate
+#include <ranges>
+namespace rv = std::views;
+namespace rs = std::ranges;
+#endif
+
+#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;
+  cin >> n;
+
+  if (n == 1 || n == 3) {
+    cout << "-1\n";
+    return;
+  }
+
+  u32 x = n, i = 1;
+  for (; i <= n / 2; ++i, --x) {
+    cout << x << ' ';
+  }
+  x = 1;
+  for (; i <= n; ++i, ++x) {
+    cout << x << " \n"
+    [i == 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/826/1741c.cc b/codeforces/826/1741c.cc
new file mode 100644
index 0000000..0139702
--- /dev/null
+++ b/codeforces/826/1741c.cc
@@ -0,0 +1,90 @@
+#include <bits/stdc++.h> // {{{
+
+#include <version>
+#ifdef __cpp_lib_ranges_enumerate
+#include <ranges>
+namespace rv = std::views;
+namespace rs = std::ranges;
+#endif
+
+#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;
+  cin >> n;
+  vector<u32> a(n);
+  for (u32 i = 0; i < n; ++i) {
+    cin >> a[i];
+  }
+
+  u32 ans = n;
+  u64 target = 0;
+
+  for (u32 i = 1; i <= n; ++i) {
+    target += a[i - 1];
+    u32 big_block = i;
+    u32 curlen = 0;
+    u64 total = 0;
+    for (u32 j = i + 1; j <= n; ++j) {
+      total += a[j - 1];
+      ++curlen;
+      if (total == target) {
+        big_block = max(big_block, curlen);
+        total = 0;
+        curlen = 0;
+      } else if (total > target) {
+        break;
+      }
+    }
+
+    if (total == 0)
+      ans = min(ans, big_block);
+  }
+
+  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/826/1741d.cc b/codeforces/826/1741d.cc
new file mode 100644
index 0000000..89c832c
--- /dev/null
+++ b/codeforces/826/1741d.cc
@@ -0,0 +1,104 @@
+#include <bits/stdc++.h> // {{{
+
+#include <version>
+#ifdef __cpp_lib_ranges_enumerate
+#include <ranges>
+namespace rv = std::views;
+namespace rs = std::ranges;
+#endif
+
+#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;
+  cin >> n;
+  vector<u32> a(n);
+  for (auto &e : a)
+    cin >> e;
+
+  auto f = [&](auto &&self, i32 l, i32 r) -> i64 {
+    if (l + 1 == r) {
+      return 0;
+    }
+
+    i32 m = l + (r - l) / 2;
+
+    i64 left = self(self, l, m);
+    i64 right = self(self, m, r);
+
+    if (left == -1 || right == -1) {
+      return -1;
+    }
+
+    bool oknoswap = true;
+    for (i32 i = l; i < r - 1; ++i) {
+      oknoswap = oknoswap && (a[i] < a[i + 1]);
+    }
+
+    if (oknoswap) {
+      return left + right;
+    }
+
+    bool okswap = true;
+    for (i32 i = m, cnt = 0; cnt < r - l - 1; ++cnt) {
+      i32 nxt = i == r - 1 ? l : i + 1;
+      okswap = okswap && (a[i] < a[nxt]);
+      i = nxt;
+    }
+    if (okswap) {
+      for (i32 i = 0; i < m - l; ++i) {
+        swap(a[l + i], a[m + i]);
+      }
+      return left + right + 1;
+    }
+
+    return -1;
+  };
+
+  cout << f(f, 0, n) << '\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;
+}
+// }}}
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
index 0000000..6fc3e89
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diff --git a/codeforces/826/io/introductory_problems2431.1.cpout b/codeforces/826/io/introductory_problems2431.1.cpout
new file mode 100644
index 0000000..8313069
--- /dev/null
+++ b/codeforces/826/io/introductory_problems2431.1.cpout
@@ -0,0 +1,3 @@
+7
+4
+1
diff --git a/codeforces/826/io/introductory_problems3217.1.cpin b/codeforces/826/io/introductory_problems3217.1.cpin
new file mode 100644
index 0000000..45a4fb7
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3217.1.cpin
@@ -0,0 +1 @@
+8
diff --git a/codeforces/826/io/introductory_problems3217.1.cpout b/codeforces/826/io/introductory_problems3217.1.cpout
new file mode 100644
index 0000000..8ca7df3
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3217.1.cpout
@@ -0,0 +1,8 @@
+0 3 2 3 2 3 4 5 
+3 4 1 2 3 4 3 4 
+2 1 4 3 2 3 4 5 
+3 2 3 2 3 4 3 4 
+2 3 2 3 4 3 4 5 
+3 4 3 4 3 4 5 4 
+4 3 4 3 4 5 4 5 
+5 4 5 4 5 4 5 6
diff --git a/codeforces/826/io/introductory_problems3311.1.cpin b/codeforces/826/io/introductory_problems3311.1.cpin
new file mode 100644
index 0000000..b994d66
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3311.1.cpin
@@ -0,0 +1,4 @@
+3 4
+AAAA
+BBBB
+CCDD
diff --git a/codeforces/826/io/introductory_problems3311.1.cpout b/codeforces/826/io/introductory_problems3311.1.cpout
new file mode 100644
index 0000000..6f94dab
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3311.1.cpout
@@ -0,0 +1,3 @@
+CDCD
+DCDC
+ABAB
diff --git a/codeforces/826/io/introductory_problems3399.1.cpin b/codeforces/826/io/introductory_problems3399.1.cpin
new file mode 100644
index 0000000..afc8ed8
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3399.1.cpin
@@ -0,0 +1,6 @@
+5
+4 1 2
+2 0 1
+3 0 0
+2 1 1
+4 4 1
diff --git a/codeforces/826/io/introductory_problems3399.1.cpout b/codeforces/826/io/introductory_problems3399.1.cpout
new file mode 100644
index 0000000..77cb610
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3399.1.cpout
@@ -0,0 +1,11 @@
+YES
+1 4 3 2
+2 1 3 4
+NO
+YES
+1 2 3
+1 2 3
+YES
+1 2
+2 1
+NO
diff --git a/codeforces/826/io/introductory_problems3419.1.cpin b/codeforces/826/io/introductory_problems3419.1.cpin
new file mode 100644
index 0000000..7ed6ff8
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3419.1.cpin
@@ -0,0 +1 @@
+5
diff --git a/codeforces/826/io/introductory_problems3419.1.cpout b/codeforces/826/io/introductory_problems3419.1.cpout
new file mode 100644
index 0000000..55bad9f
--- /dev/null
+++ b/codeforces/826/io/introductory_problems3419.1.cpout
@@ -0,0 +1,5 @@
+0 1 2 3 4
+1 0 3 2 5
+2 3 0 1 6
+3 2 1 0 7
+4 5 6 7 0