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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. inline int power(int a, int b) {
  6.     int x = 1;
  7.     while (b) {
  8.         if (b & 1) x *= a;
  9.         a *= a;
  10.         b >>= 1;
  11.     }
  12.     return x;
  13. }
  14.  
  15.  
  16. const int M = 1000000007;
  17. const int N = 3e5+9;
  18. const int INF = 2e9+1;
  19. const int LINF = 2000000000000000001;
  20.  
  21. //_ ***************************** START Below *******************************
  22.  
  23.  
  24. //* Start with valid window 
  25.  
  26. void consistency(string str, int k) {
  27. 	int n = str.size();
  28.  
  29. 	int ans = 0;
  30.  
  31.  
  32. 	int s = 0, e = 0;
  33. 	deque<char> up, down;
  34.  
  35. 	while(e<n){
  36. 		while(!up.empty() && str[up.back()]  > str[e] ) up.pop_back();
  37. 		up.push_back(e);
  38.  
  39. 		while(!down.empty() && str[down.back()] < str[e] ) down.pop_back();
  40. 		down.push_back(e);
  41.  
  42. 		//* Invalid window => Shrink it (untill it becomes valid)
  43. 		while(s<=e){
  44. 			int mini = (str[up.front()] - 'a');
  45. 			int maxi = (str[down.front()] - 'a');
  46. 			if(maxi - mini <= k ){
  47. 				break;
  48. 			}
  49.  
  50. 			if(up.front() == s) up.pop_front();
  51. 			if(down.front() == s) down.pop_front();
  52. 			s++;
  53. 		}
  54.  
  55. 		int len = e-s+1;
  56. 		ans = max(ans, len);
  57.  
  58. 		e++;
  59. 	}
  60.  
  61. 	cout << ans << endl;
  62.  
  63. }
  64.  
  65.  
  66. void solve() {
  67.  
  68.     int k;
  69.     cin >> k;
  70.  
  71. 	string str;
  72. 	cin >> str;
  73.  
  74.     consistency(str, k);
  75.  
  76. }
  77.  
  78.  
  79.  
  80.  
  81.  
  82. int32_t main() {
  83.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  84.  
  85.     int t = 1;
  86.     // cin >> t;
  87.     while (t--) {
  88.         solve();
  89.     }
  90.  
  91.     return 0;
  92. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
2
abccabcdabdabd
stdout 
7
https://ideone.com/hn0oQu
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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