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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int INF = 1e9;
  5. int nxt[1005][26], dp[1005][1005];
  6.  
  7. int main() {
  8.     ios::sync_with_stdio(false);
  9.     cin.tie(NULL);
  10.  
  11.     string a, b;
  12.     cin >> a >> b;
  13.  
  14.     int n = a.length();
  15.     int m = b.length();
  16.  
  17.     for (int c = 0; c < 26; ++c) nxt[m][c] = -1;
  18.     for (int i = m - 1; i >= 0; --i) {
  19.         for (int c = 0; c < 26; ++c) nxt[i][c] = nxt[i + 1][c];
  20.         nxt[i][b[i] - 'a'] = i;
  21.     }
  22.  
  23.     for (int j = 0; j <= m; ++j) dp[n][j] = INF;
  24.  
  25.     for (int i = n - 1; i >= 0; --i) {
  26.         int char_idx = a[i] - 'a';
  27.         for (int j = 0; j <= m; ++j) {
  28.             int option1 = dp[i + 1][j];
  29.             int pos = (j < m) ? nxt[j][char_idx] : -1;
  30.             int option2;
  31.  
  32.             if (pos == -1) {
  33.                 option2 = 1;
  34.             } else {
  35.                 option2 = 1 + dp[i + 1][pos + 1];
  36.             }
  37.  
  38.             dp[i][j] = min(option1, option2);
  39.         }
  40.     }
  41.  
  42.     cout << dp[0][0];
  43.  
  44.     return 0;
  45. }
  46.  
Success #stdin #stdout 0.01s 5312KB
comments (?)
stdin 
Standard input is empty
stdout 
1000000000
https://ideone.com/ydZivh
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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