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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){
  33.  
  34.     vector<vector<bool>> dp(n, vector<bool>(n, false)); 
  35.  
  36.     int ct = 0; 
  37.  
  38.     for(int len=1; len<=n; len++){
  39.         for(int i=0, j=len-1; j<n; i++, j++){   
  40.             if(len==1){
  41.                 dp[i][j] = true;
  42.                 ct++;
  43.             }
  44.             else if(len == 2){
  45.                 if(a[i] == a[j]){
  46.                     dp[i][j] = true;
  47.                     ct++;
  48.                 }
  49.             }
  50.             else{
  51.                 if(a[i] == a[j] && dp[i+1][j-1]){
  52.                     dp[i][j] = true;
  53.                     ct++;
  54.                 }
  55.             }
  56.         }
  57.     }   
  58.  
  59.     return ct;
  60. }
  61.  
  62.  
  63.  
  64.  
  65.  
  66.  
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76. int practice(int n){
  77.  
  78.  
  79.     return 0;
  80. }
  81.  
  82.  
  83.  
  84.  
  85.  
  86. void solve() {
  87.  
  88. 	cin >> a;
  89. 	int n = a.size();
  90.  
  91.     cout << consistency(n) << endl;
  92.  
  93.  
  94. }
  95.  
  96.  
  97.  
  98.  
  99.  
  100. int32_t main() {
  101.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  102.  
  103.     int t = 1;
  104.     // cin >> t;
  105.     while (t--) {
  106.         solve();
  107.     }
  108.  
  109.     return 0;
  110. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/DtSE4z
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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