fork download
copy 
  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4. ll n,k,kq = 0,t = 0,l,h,m,a[100005],vt = 0;
  5. string s;
  6. int main()
  7. {
  8.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  9.     freopen("XAUCON.inp", "r", stdin);
  10.     freopen("XAUCON.out", "w", stdout);
  11.     cin >> n >> k;
  12.     cin >> s;
  13.     for(int i = 1; i <= n; i++)
  14.     {
  15.         a[i] = a[i-1] + (int)(s[i-1]);
  16.     }
  17.     for(int i = 1; i <= n; i++)
  18.     {
  19.         l = i, h = n,vt = i-1;
  20.         while(l <= h)
  21.         {
  22.             m = (l+h)>>1;
  23.             if(a[m] - a[i-1] >= k)
  24.             {
  25.                 h = m - 1;
  26.                 vt = m;
  27.             }
  28.             else l = m + 1;
  29.         }
  30.         if(vt != i-1)
  31.             kq += n - vt + 1;
  32.     }
  33.     cout << kq;
  34. }
  35.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/DhJRxE
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!