1 files changed, 36 insertions, 0 deletions
diff --git a/works/solutions/acwing/1230.cpp b/works/solutions/acwing/1230.cpp
new file mode 100644
index 0000000..958cbdd
--- /dev/null
+++ b/works/solutions/acwing/1230.cpp
@@ -0,0 +1,36 @@
+#include <iostream>
+
+using ll = long long;
+
+const int M = 100010;
+
+int N, K;
+ll p;
+int c[M];
+ll result;
+
+int main() {
+  std::ios_base::sync_with_stdio(false);
+  std::cin.tie(nullptr);
+
+  std::cin >> N >> K;
+
+  c[0] = 1;
+
+  for (int i = 1; i <= N; i++) {
+    int a;
+    std::cin >> a;
+
+    p += a;
+
+    int r = p % K;
+
+    result += c[r];
+
+    c[r]++;
+  }
+
+  std::cout << result;
+
+  return 0;
+}