fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define e '\n'
  4. #define ll long long
  5. #define maxn 1000006
  6. int a[maxn];
  7. int b[maxn];
  8. int ab[maxn];
  9. ll c;
  10. string s;
  11. int n;
  12.  
  13. bool check(int x){
  14.     for(int i = 1;i+x-1<=n;i++){
  15.         int k = i + x - 1;
  16.         int cnt = ab[k] - b[k] * a[i-1];
  17.         if(cnt <= c) return 1;
  18.     }
  19.     return 0;
  20. }
  21.  
  22. int main(){
  23.     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  24.     cin >> n >> c >> s;
  25.     s = ' ' + s;
  26.     for(int i = 1;i<=n;i++){
  27.         if(s[i] == 'a'){
  28.             a[i]++;
  29.         }
  30.         if(s[i] == 'b') {
  31.             b[i]++;
  32.             ab[i] += b[i] * a[i-1];
  33.         }
  34.         a[i] += a[i-1];
  35.         b[i] += b[i-1];
  36.         ab[i] += ab[i-1];
  37.     }
  38.     int l = 1;
  39.     int r = n;
  40.     int res = 0;
  41.     while(l <= r){
  42.         int mid = (l + r) / 2;
  43.         if(check(mid)){
  44.             res = mid;
  45.             l = mid + 1;
  46.         }
  47.         else r = mid - 1;
  48.     }
  49.     cout << res;
  50. }
  51.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/cFu7Da
language:
C++ (gcc 8.3)
created:
1 hour 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!