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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5.  
  6.  
  7. const int M = 1000000007;
  8. const int N = 3e5+9;
  9. const int INF = 2e9+1;
  10. const int MAXN = 100000;
  11. const int LINF = 2000000000000000001;
  12.  
  13. //_ ***************************** START Below *******************************
  14.  
  15.  
  16.  
  17.  
  18. string a;
  19.  
  20. int consistency(int n, int k){
  21. 	int ans = 0;
  22.  
  23. 	int act = 0;
  24. 	int bct = 0;
  25.     int pairs = 0;
  26.  
  27. 	int s = 0, e = 0;
  28.  
  29. 	while(e<n){
  30. 		if(a[e] == 'a') act++;
  31. 		else if(a[e] == 'b') bct++;
  32.  
  33.         if(a[e] == 'b') pairs += act;
  34.  
  35.         if(pairs <= k){
  36.             ans = max(ans, e-s+1);
  37.             e++;
  38.         }
  39.         else{
  40.             while(s<=e && pairs > k){
  41.                 if(a[s] == 'a') act--;
  42.                 else if(a[s] == 'b') bct--;
  43.  
  44.                 if(a[s] == 'a') pairs -= bct;
  45.                 s++;
  46.             }
  47.             ans = max(ans, e-s+1);
  48.             e++;
  49.         }
  50. 	}
  51.  
  52. 	return ans;
  53.  
  54. }
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64. void solve() {
  65.  
  66. 	int n, k;
  67. 	cin >> n >> k;
  68.     cin >> a;
  69. 	cout << consistency(n, k) << endl;
  70.  
  71.  
  72.  
  73.  
  74. }
  75.  
  76.  
  77.  
  78.  
  79.  
  80. int32_t main() {
  81.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  82.  
  83.     int t = 1;
  84.     while (t--) {
  85.         solve();
  86.     }
  87.  
  88.     return 0;
  89. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/GShKKz
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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