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  1. #include <atcoder/modint>
  2. #include <bits/stdc++.h>
  3.  
  4. using namespace std;
  5.  
  6. using namespace atcoder;
  7. using mint = modint998244353;
  8.  
  9. int solve(vector<long long> &a) {
  10.     int n = a.size();
  11.     long long int noOfOperations = 0;
  12.     // dp[i] is the number of black subsets of the first i elements such that
  13.     // the i-th element is necessarily painted black.
  14.     vector<mint> dp(n), offload(n);
  15.     dp[0] = 1;
  16.     for (int i = 0; i < n; i++) {
  17.         for (int j = i + a[i]; j < n; j += a[i]) {
  18.             noOfOperations++;
  19.             dp[j] += dp[i] + offload[i];
  20.             if (a[j] == a[i]) {
  21.                 offload[j] += offload[i] + dp[i];
  22.                 break;
  23.             }
  24.         }
  25.     }
  26.  
  27.     mint ans = 0;
  28.     for (int i = 0; i < n; i++) {
  29.         ans += dp[i];
  30.     }
  31.     cout<<"No Of Operations: "<<noOfOperations<<endl;
  32.     return ans.val();
  33. }
  34.  
  35. int main() {
  36.     const int n=200000;
  37.     vector<long long> a(n,1);
  38.     int R=447;
  39.     for(int i=0,nxt=R;i<n;i++){
  40.         if(i==nxt){
  41.             R-=1;
  42.             if(R==0)
  43.                 break;
  44.             nxt=i+R;
  45.         }
  46.         a[i]=R;
  47.     }
  48.     cout << solve(a) << endl;
  49.     return 0;
  50. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:1:10: fatal error: atcoder/modint: No such file or directory
 #include <atcoder/modint>
          ^~~~~~~~~~~~~~~~
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/VPCrDo
language:
C++14 (gcc 8.3)
created:
350 days ago
visibility:
secret

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