diff --git a/codeforces/937/.clang-format b/codeforces/937/.clang-format
new file mode 100644
index 0000000..e7350c4
--- /dev/null
+++ b/codeforces/937/.clang-format
@@ -0,0 +1,9 @@
+BasedOnStyle: Google
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortCompoundRequirementOnASingleLine: false
+AllowShortEnumsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLambdasOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
diff --git a/codeforces/937/.clangd b/codeforces/937/.clangd
new file mode 100644
index 0000000..5b59a31
--- /dev/null
+++ b/codeforces/937/.clangd
@@ -0,0 +1,34 @@
+CompileFlags:
+	Add:
+		-O2
+		-Wall
+		-Wextra
+		-Wpedantic
+		-Wshadow
+		-Wformat=2
+		-Wfloat-equal
+		-Wlogical-op
+		-Wshift-overflow=2
+		-Wnon-virtual-dtor
+		-Wold-style-cast
+		-Wcast-qual
+		-Wuseless-cast
+		-Wno-sign-promotion
+		-Wcast-align
+		-Wunused
+		-Woverloaded-virtual
+		-Wconversion
+		-Wsign-conversion
+		-Wmisleading-indentation
+		-Wduplicated-cond
+		-Wduplicated-branches
+		-Wlogical-op
+		-Wnull-dereference
+		-Wformat=2
+		-Wformat-overflow
+		-Wformat-truncation
+		-Wdouble-promotion
+		-Wundef
+		-DLOCAL
+		-std=c++20
+		-Wno-unknown-pragmas
diff --git a/codeforces/937/a.cc b/codeforces/937/a.cc
new file mode 100644
index 0000000..1999f16
--- /dev/null
+++ b/codeforces/937/a.cc
@@ -0,0 +1,44 @@
+#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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+//  }}}
+
+void solve() {
+  u32 a, b, c;
+  cin >> a >> b >> c;
+  if (a < b && b < c) {
+    cout << "STAIR";
+  } else if (a < b && b > c) {
+    cout << "PEAK";
+  } else {
+    cout << "NONE";
+  }
+  cout << '\n';
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}
diff --git a/codeforces/937/b.cc b/codeforces/937/b.cc
new file mode 100644
index 0000000..5523ddc
--- /dev/null
+++ b/codeforces/937/b.cc
@@ -0,0 +1,54 @@
+#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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+//  }}}
+
+void solve() {
+  u32 n;
+  cin >> n;
+
+  vector<vector<char>> board(2 * n, vector<char>(2 * n, '.'));
+  for (u32 i = 0; i < n; ++i) {
+    for (u32 j = 0; j < n; ++j) {
+      if ((i & 1) == (j & 1)) {
+        board[2 * i][2 * j] = '#';
+        board[2 * i + 1][2 * j] = '#';
+        board[2 * i + 1][2 * j + 1] = '#';
+        board[2 * i][2 * j + 1] = '#';
+      }
+    }
+  }
+  for (auto& r : board) {
+    for (auto& c : r) {
+      cout << c;
+    }
+    cout << '\n';
+  }
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}
diff --git a/codeforces/937/c.cc b/codeforces/937/c.cc
new file mode 100644
index 0000000..f0a339d
--- /dev/null
+++ b/codeforces/937/c.cc
@@ -0,0 +1,55 @@
+#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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+//  }}}
+
+void solve() {
+  string time;
+  cin >> time;
+  u32 hour = stoi(time.substr(0, 2));
+  u32 minute = stoi(time.substr(3, 2));
+
+  bool pm = hour >= 12;
+  if (hour > 12) {
+    hour %= 12;
+  }
+  if (hour == 0) {
+    hour = 12;
+  }
+
+  if (hour < 10) {
+    cout << '0';
+  }
+  cout << hour << ':';
+  if (minute < 10) {
+    cout << '0';
+  }
+  cout << minute << ' ' << (pm ? "PM" : "AM") << '\n';
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}
diff --git a/codeforces/937/compile_flags.txt b/codeforces/937/compile_flags.txt
new file mode 100644
index 0000000..af7fb72
--- /dev/null
+++ b/codeforces/937/compile_flags.txt
@@ -0,0 +1,31 @@
+-O2
+-Wall
+-Wextra
+-Wpedantic
+-Wshadow
+-Wformat=2
+-Wfloat-equal
+-Wlogical-op
+-Wshift-overflow=2
+-Wnon-virtual-dtor
+-Wold-style-cast
+-Wcast-qual
+-Wuseless-cast
+-Wno-sign-promotion
+-Wcast-align
+-Wunused
+-Woverloaded-virtual
+-Wconversion
+-Wsign-conversion
+-Wmisleading-indentation
+-Wduplicated-cond
+-Wduplicated-branches
+-Wlogical-op
+-Wnull-dereference
+-Wformat=2
+-Wformat-overflow
+-Wformat-truncation
+-Wdouble-promotion
+-Wundef
+-DLOCAL
+-std=c++20
diff --git a/codeforces/937/d.cc b/codeforces/937/d.cc
new file mode 100644
index 0000000..495a178
--- /dev/null
+++ b/codeforces/937/d.cc
@@ -0,0 +1,171 @@
+#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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+//  }}}
+
+#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 = null_type>
+using hashtable = 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>>;
+
+#endif
+#ifdef PB_DS_TREE_POLICY_HPP
+template <typename T>
+using multitree = 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
+
+hashtable<u64> seen;
+bitset<100000 + 1> dp;
+
+void solve() {
+  u64 n;
+  cin >> n;
+
+  if (seen.find(n) != seen.end()) {
+    cout << "YES\n";
+  } else
+    cout << "NO\n";
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  dp[1] = true;
+  seen.insert(1);
+
+  vector<u64> binaries;
+  for (u64 i = 1; i <= 100000; ++i) {
+    u64 I = i;
+    bool good = true;
+    while (I) {
+      if (I % 10 > 1) {
+        good = false;
+        break;
+      }
+      I /= 10;
+    }
+
+    if (good)
+      binaries.push_back(i);
+  }
+
+  for (u64 bin : binaries) {
+    for (u64 j = 1; j * bin <= 100000; ++j) {
+      if (dp[j]) {
+        dp[j * bin] = true;
+        seen.insert(j * bin);
+      }
+    }
+  }
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}
diff --git a/codeforces/937/debug_flags.txt b/codeforces/937/debug_flags.txt
new file mode 100644
index 0000000..03cba1b
--- /dev/null
+++ b/codeforces/937/debug_flags.txt
@@ -0,0 +1,12 @@
+-g3
+-fsanitize=address,undefined
+-fsanitize=float-divide-by-zero
+-fsanitize=float-cast-overflow
+-fno-sanitize-recover=all
+-fstack-protector-all
+-fstack-usage
+-fno-omit-frame-pointer
+-fno-inline
+-ffunction-sections
+-D_GLIBCXX_DEBUG
+-D_GLIBCXX_DEBUG_PEDANTIC
diff --git a/codeforces/937/e.cc b/codeforces/937/e.cc
new file mode 100644
index 0000000..fd81a12
--- /dev/null
+++ b/codeforces/937/e.cc
@@ -0,0 +1,70 @@
+#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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+//  }}}
+
+void solve() {
+  u32 n;
+  cin >> n;
+  string s;
+  cin >> s;
+  u64 ans = n;
+  for (u32 i = 1; i < n; ++i) {
+    if (n % i) {
+      continue;
+    }
+    unordered_map<string, int> seen;
+    bool bad = false;
+    for (u32 j = 0; j < n; j += i) {
+      ++seen[s.substr(j, i)];
+      if (seen.size() > 2) {
+        bad = true;
+        break;
+      }
+    }
+    if (bad)
+      continue;
+    if (seen.size() == 1) {
+      ans = i;
+      break;
+    } else if (seen.size() == 2) {
+      int first = seen.begin()->second, second = next(seen.begin())->second;
+      int diff = 0;
+      for (u32 j = 0; j < seen.begin()->first.size(); ++j) {
+        diff += seen.begin()->first[j] != next(seen.begin())->first[j];
+      }
+      if ((first == 1 || second == 1) && diff <= 1) {
+        ans = i;
+        break;
+      }
+    }
+  }
+  cout << ans << endl;
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}
diff --git a/codeforces/937/f.cc b/codeforces/937/f.cc
new file mode 100644
index 0000000..8b77fb3
--- /dev/null
+++ b/codeforces/937/f.cc
@@ -0,0 +1,73 @@
+#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;
+
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+using f64 = double;
+using f128 = long double;
+//  }}}
+
+void solve() {
+  u64 a, b, c;
+  cin >> a >> b >> c;
+
+  u64 depth = 0;
+  u64 to_take = 1;
+
+  // NOTE :look at prev wrong submissions; full tree assumptions, when u can
+  // have b on last layer this should be oe of ur first observatoins
+  while (to_take && (a > 0 || b > 0 || c > 0)) {
+    ++depth;
+    u64 next_to_take = 0;
+
+    auto take = min(a, to_take);
+    a -= take;
+    next_to_take = 2 * take;
+    to_take -= take;
+
+    take = min(b, to_take);
+    b -= take;
+    to_take -= take;
+    next_to_take += take;
+
+    take = min(c, to_take);
+    c -= take;
+    to_take -= take;
+
+    if (to_take != 0) {
+      cout << -1 << '\n';
+      return;
+    }
+
+    to_take = next_to_take;
+  }
+
+  if (to_take > 0 || a > 0 || b > 0 || c > 0) {
+    cout << -1 << '\n';
+  } else {
+    cout << depth - 1 << '\n';
+  }
+}
+
+int main() {  // {{{
+  cin.tie(nullptr)->sync_with_stdio(false);
+  cin.exceptions(cin.failbit);
+
+  int tc = 1;
+  cin >> tc;
+
+  for (int t = 0; t < tc; ++t) {
+    solve();
+  }
+
+  return 0;
+}
+// }}}
diff --git a/codeforces/937/io/a.in b/codeforces/937/io/a.in
new file mode 100644
index 0000000..2a59631
--- /dev/null
+++ b/codeforces/937/io/a.in
@@ -0,0 +1,8 @@
+7
+1 2 3
+3 2 1
+1 5 3
+3 4 1
+0 0 0
+4 1 7
+4 5 7
diff --git a/codeforces/937/io/a.out b/codeforces/937/io/a.out
new file mode 100644
index 0000000..03bf546
--- /dev/null
+++ b/codeforces/937/io/a.out
@@ -0,0 +1,10 @@
+STAIR
+NONE
+PEAK
+PEAK
+NONE
+NONE
+STAIR
+
+[code]: 0
+[time]: 10.5526 ms
diff --git a/codeforces/937/io/b.in b/codeforces/937/io/b.in
new file mode 100644
index 0000000..4934959
--- /dev/null
+++ b/codeforces/937/io/b.in
@@ -0,0 +1,5 @@
+4
+1
+2
+3
+4
diff --git a/codeforces/937/io/b.out b/codeforces/937/io/b.out
new file mode 100644
index 0000000..230211e
--- /dev/null
+++ b/codeforces/937/io/b.out
@@ -0,0 +1,23 @@
+##
+##
+##..
+##..
+..##
+..##
+##..##
+##..##
+..##..
+..##..
+##..##
+##..##
+##..##..
+##..##..
+..##..##
+..##..##
+##..##..
+##..##..
+..##..##
+..##..##
+
+[code]: 0
+[time]: 11.0681 ms
\ No newline at end of file
diff --git a/codeforces/937/io/c.in b/codeforces/937/io/c.in
new file mode 100644
index 0000000..f1df236
--- /dev/null
+++ b/codeforces/937/io/c.in
@@ -0,0 +1,12 @@
+11
+09:41
+18:06
+12:14
+00:59
+00:00
+14:34
+01:01
+19:07
+11:59
+12:00
+21:37
diff --git a/codeforces/937/io/c.out b/codeforces/937/io/c.out
new file mode 100644
index 0000000..57f20e7
--- /dev/null
+++ b/codeforces/937/io/c.out
@@ -0,0 +1,14 @@
+09:41 AM
+06:06 PM
+12:14 PM
+12:59 AM
+12:00 AM
+02:34 PM
+01:01 AM
+07:07 PM
+11:59 AM
+12:00 PM
+09:37 PM
+
+[code]: 0
+[time]: 4.08173 ms
\ No newline at end of file
diff --git a/codeforces/937/io/d.in b/codeforces/937/io/d.in
new file mode 100644
index 0000000..f402b95
--- /dev/null
+++ b/codeforces/937/io/d.in
@@ -0,0 +1,12 @@
+11
+121
+1
+14641
+12221
+10110
+100000
+99
+112
+2024
+12421
+1001
diff --git a/codeforces/937/io/d.out b/codeforces/937/io/d.out
new file mode 100644
index 0000000..e24ad61
--- /dev/null
+++ b/codeforces/937/io/d.out
@@ -0,0 +1,14 @@
+YES
+YES
+YES
+YES
+YES
+YES
+NO
+NO
+NO
+NO
+YES
+
+[code]: 0
+[time]: 12.0294 ms
\ No newline at end of file
diff --git a/codeforces/937/io/e.in b/codeforces/937/io/e.in
new file mode 100644
index 0000000..fd643db
--- /dev/null
+++ b/codeforces/937/io/e.in
@@ -0,0 +1,11 @@
+5
+4
+abaa
+4
+abba
+13
+slavicgslavic
+8
+hshahaha
+20
+stormflamestornflame
diff --git a/codeforces/937/io/e.out b/codeforces/937/io/e.out
new file mode 100644
index 0000000..a295413
--- /dev/null
+++ b/codeforces/937/io/e.out
@@ -0,0 +1,8 @@
+1
+4
+13
+2
+10
+
+[code]: 0
+[time]: 12.5105 ms
\ No newline at end of file
diff --git a/codeforces/937/io/f.in b/codeforces/937/io/f.in
new file mode 100644
index 0000000..f18b680
--- /dev/null
+++ b/codeforces/937/io/f.in
@@ -0,0 +1,2 @@
+1
+2 1 3
diff --git a/codeforces/937/io/f.out b/codeforces/937/io/f.out
new file mode 100644
index 0000000..cc9e753
--- /dev/null
+++ b/codeforces/937/io/f.out
@@ -0,0 +1,4 @@
+2
+
+[code]: 0
+[time]: 11.7621 ms
\ No newline at end of file
diff --git a/codeforces/937/makefile b/codeforces/937/makefile
new file mode 100644
index 0000000..9c5450b
--- /dev/null
+++ b/codeforces/937/makefile
@@ -0,0 +1,28 @@
+.PHONY: run debug clean setup init
+
+SRC = $(word 2,$(MAKECMDGOALS))
+
+.SILENT:
+
+run:
+	sh scripts/run.sh $(SRC)
+
+debug:
+	sh scripts/debug.sh $(SRC)
+
+clean:
+	rm -rf build/*
+
+setup:
+	test -d build || mkdir -p build
+	test -d io || mkdir -p io
+	test -d scripts || mkdir -p scripts
+	test -f compile_flags.txt || cp $(HOME)/.config/cp-template/compile_flags.txt .
+	test -f .clangd || cp $(HOME)/.config/cp-template/.clangd .
+	test -f .clang-format || cp $(HOME)/.config/cp-template/.clang-format .
+
+init:
+	make setup
+
+%:
+	@:
diff --git a/codeforces/937/scripts/debug.sh b/codeforces/937/scripts/debug.sh
new file mode 100644
index 0000000..2979422
--- /dev/null
+++ b/codeforces/937/scripts/debug.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+
+. ./scripts/utils.sh
+
+SRC="$1"
+BASE=$(basename "$SRC" .cc)
+INPUT="${BASE}.in"
+OUTPUT="${BASE}.out"
+DBG_BIN="${BASE}.debug"
+
+test -d build || mkdir -p build
+test -d io || mkdir -p io
+
+test -f "$INPUT" && test ! -f "io/$INPUT" && mv "$INPUT" "io/"
+test -f "$OUTPUT" && test ! -f "io/$OUTPUT" && mv "$OUTPUT" "io/"
+
+test -f "io/$INPUT" || touch "io/$INPUT"
+test -f "io/$OUTPUT" || touch "io/$OUTPUT"
+
+INPUT="io/$INPUT"
+OUTPUT="io/$OUTPUT"
+DBG_BIN="build/$DBG_BIN"
+
+compile_source "$SRC" "$DBG_BIN" "$OUTPUT" @debug_flags.txt
+CODE=$?
+test $CODE -gt 0 && exit $CODE
+
+execute_binary "$DBG_BIN" "$INPUT" "$OUTPUT"
+exit $?
diff --git a/codeforces/937/scripts/run.sh b/codeforces/937/scripts/run.sh
new file mode 100644
index 0000000..ab9aa7d
--- /dev/null
+++ b/codeforces/937/scripts/run.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+
+. ./scripts/utils.sh
+
+SRC="$1"
+BASE=$(basename "$SRC" .cc)
+INPUT="${BASE}.in"
+OUTPUT="${BASE}.out"
+RUN_BIN="${BASE}.run"
+
+test -d build || mkdir -p build
+test -d io || mkdir -p io
+
+test -f "$INPUT" && test ! -f "io/$INPUT" && mv "$INPUT" "io/"
+test -f "$OUTPUT" && test ! -f "io/$OUTPUT" && mv "$OUTPUT" "io/"
+
+test -f "io/$INPUT" || touch "io/$INPUT"
+test -f "io/$OUTPUT" || touch "io/$OUTPUT"
+
+INPUT="io/$INPUT"
+OUTPUT="io/$OUTPUT"
+RUN_BIN="build/$RUN_BIN"
+
+compile_source "$SRC" "$RUN_BIN" "$OUTPUT" ""
+CODE=$?
+test $CODE -gt 0 && exit $CODE
+
+execute_binary "$RUN_BIN" "$INPUT" "$OUTPUT"
+exit $?
diff --git a/codeforces/937/scripts/utils.sh b/codeforces/937/scripts/utils.sh
new file mode 100644
index 0000000..e99b25b
--- /dev/null
+++ b/codeforces/937/scripts/utils.sh
@@ -0,0 +1,53 @@
+#!/bin/sh
+
+execute_binary() {
+  binary="$1"
+  input="$2"
+  output="$3"
+
+  start=$(date '+%s.%N')
+  timeout 2s ./"$binary" <"$input" >"$output" 2>&1
+  CODE=$?
+  end=$(date '+%s.%N')
+  truncate -s "$(head -n 1000 "$output" | wc -c)" "$output"
+
+  if [ $CODE -ge 124 ]; then
+    MSG=''
+    case $CODE in
+    124) MSG='TIMEOUT' ;;
+    128) MSG='SIGILL' ;;
+    130) MSG='SIGABRT' ;;
+    131) MSG='SIGBUS' ;;
+    136) MSG='SIGFPE' ;;
+    135) MSG='SIGSEGV' ;;
+    137) MSG='SIGPIPE' ;;
+    139) MSG='SIGTERM' ;;
+    esac
+    [ $CODE -ne 124 ] && sed -i '$d' "$output"
+    test -n "$MSG" && printf '\n[code]: %s (%s)' "$CODE" "$MSG" >>"$output"
+  else
+    printf '\n[code]: %s' "$CODE" >>"$output"
+  fi
+
+  printf '\n[time]: %s ms' "$(awk "BEGIN {print ($end - $start) * 1000}")" >>$output
+  return $CODE
+}
+
+compile_source() {
+  src="$1"
+  bin="$2"
+  output="$3"
+  flags="$4"
+
+  test -f "$bin" && rm "$bin" || true
+  g++ @compile_flags.txt $flags "$src" -o "$bin" 2>"$output"
+  CODE=$?
+
+  if [ $CODE -gt 0 ]; then
+    printf '\n[code]: %s' "$CODE" >>"$output"
+    return $CODE
+  else
+    echo '' >"$output"
+    return 0
+  fi
+}