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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. 	deque<int> up, down;
  31.  
  32. 	int s = 0 , e = 0;
  33.  
  34. 	while(e<n){
  35. 		while(!up.empty() && str[e] < str[up.front()]) up.pop_front();
  36. 		up.push_back(e);
  37.  
  38. 		while(!down.empty() && str[e] > str[down.front()]) down.pop_front();
  39. 		down.push_back(e);
  40.  
  41. 		while(s<=e){
  42. 			int maxi = str[down.front()];
  43. 			int mini = str[up.front()];
  44.  
  45. 			if(maxi - mini <= k) break;
  46.  
  47. 			if(up.front() == s) up.pop_front();
  48. 			if(down.front() == s) down.pop_front();
  49. 			s++;
  50. 		}
  51.  
  52. 		ans = max(ans, e-s+1);
  53. 		e++;
  54.  
  55. 	}
  56.  
  57. 	cout << ans << endl;
  58.  
  59. }
  60.  
  61.  
  62. void solve() {
  63.  
  64.     int k;
  65.     cin >> k;
  66.  
  67. 	string str;
  68. 	cin >> str;
  69.  
  70.     consistency(str, k);
  71.  
  72. }
  73.  
  74.  
  75.  
  76.  
  77.  
  78. int32_t main() {
  79.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  80.  
  81.     int t = 1;
  82.     // cin >> t;
  83.     while (t--) {
  84.         solve();
  85.     }
  86.  
  87.     return 0;
  88. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/p1L0s7
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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