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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve() {
  5.     int n;
  6.     cin >> n;
  7.     vector<int> a(n + 1);
  8.     for (int i = 1; i <= n; i++) cin >> a[i];
  9.  
  10.     vector<int> bad(n + 1), left(n + 1, -1);
  11.     for (int k = 1; k <= n; k++) {
  12.         for (int j = 0; j < a[k]; j++) {
  13.             int lo = k * j;
  14.             if (lo > n - 1) break;
  15.             int hi = min(lo + k, n) - 1;
  16.             left[hi] = max(left[hi], lo);
  17.         }
  18.  
  19.         int lo = min(k * a[k], n);
  20.         int hi = min(lo + k, n);
  21.         bad[lo]++;
  22.         bad[hi]--;
  23.     }
  24.     for (int i = 1; i <= n; i++) bad[i] += bad[i - 1];
  25.  
  26.     vector<long long> dp(n);
  27.     int preleft = -1;
  28.     long long total = 1;
  29.     const long long MOD = 1000000007;
  30.     for (int i = 0; i < n; i++) {
  31.         if (bad[i] == 0) {
  32.             dp[i] = total;
  33.             total = (total + dp[i]) % MOD;
  34.         }
  35.         int curleft = left[i];
  36.         for (int j = preleft; j < curleft; j++) {
  37.             if (j == -1) total--;
  38.             else total -= dp[j];
  39.             total = (total + MOD) % MOD;
  40.         }
  41.         preleft = max(preleft, curleft);
  42.     }
  43.  
  44.     cout << total << '\n';
  45. }
  46.  
  47. int main() {
  48.     int t;
  49.     cin >> t;
  50.     while (t--) solve();
  51. }
  52.  
Success #stdin #stdout 0.46s 5316KB
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https://ideone.com/Y2tlkB
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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