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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.  
  8.     int t;
  9.     cin >> t;
  10.  
  11.     while (t--) {
  12.         int n, k;
  13.         cin >> n >> k;
  14.  
  15.         vector<long long> a(n), pre(n);
  16.         for (int i = 0; i < n; i++) cin >> a[i];
  17.  
  18.         pre[0] = a[0]%k;
  19.         for (int i = 1; i < n; i++) pre[i] = (pre[i - 1] + a[i])%k;
  20.  
  21.         vector<int> cnt(k);
  22.         long long ans = 0;
  23.  
  24.         for (int i = k; i < n; i++) {
  25.             int j = i - k - 1;
  26.             if (j < 0) cnt[0]++;
  27.             else cnt[pre[j]]++;
  28.             ans += cnt[pre[i]];
  29.         }
  30.  
  31.         cout << ans << '\n';
  32.     }
  33. }
  34.  
Success #stdin #stdout 0.01s 5272KB
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https://ideone.com/MxJz7W
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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