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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. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. string a;
  31.  
  32. int consistency(int n, int l, int r){
  33.  
  34.     vector<vector<bool>> dp(n, vector<bool>(n, false));
  35.     vector<vector<int>> dpCt(n, vector<int>(n, 0));
  36.  
  37.     for(int gap=0; gap<n; gap++){
  38.     	for(int i=0, j=gap; j<n; i++,j++){
  39.     		if(gap == 0){
  40.     			dp[i][j] = true;
  41.     			dpCt[i][j] = 1;
  42.     		}
  43.     		else if(gap == 1){
  44.     			if(a[i] == a[j]){
  45.     				dp[i][j] = true;
  46.     				dpCt[i][j] = 3;
  47.     			}
  48.     			else{
  49.     				dpCt[i][j] = 2;
  50.     			}
  51.     		}
  52.     		else{
  53.     			dpCt[i][j] = dpCt[i][j-1] + dpCt[i+1][j] - dpCt[i+1][j-1];
  54.  
  55.     			if(a[i] == a[j] && dp[i+1][j-1] ){
  56.     				dp[i][j] = true;
  57.     				dpCt[i][j]++;
  58.     			}
  59.     		}
  60.     	}
  61.     }
  62.  
  63.  
  64. 	return dpCt[l][r];
  65. }
  66.  
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76.  
  77.  
  78.  
  79.  
  80.  
  81. int practice(int n, int l, int r){
  82.  
  83.  
  84.     return 0;
  85. }
  86.  
  87.  
  88.  
  89.  
  90.  
  91. void solve() {
  92.  
  93.     int n, l, r;
  94.     cin >> n >> l >> r;
  95.  
  96.     cin >> a;
  97.  
  98.     cout << consistency(n, l, r) << endl;
  99.  
  100.  
  101. }
  102.  
  103.  
  104.  
  105.  
  106.  
  107. int32_t main() {
  108.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  109.  
  110.     int t = 1;
  111.     // cin >> t;
  112.     while (t--) {
  113.         solve();
  114.     }
  115.  
  116.     return 0;
  117. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/mpoD4k
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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