func_code_string: #include <bits/stdc++.h>   using namespace std;   string s, t;   int l[200005], r[200005];   int dp[30][200005];   void gd() {     cout <<  No ;     exit(0);   }   bool check(int lr, int rl, int c) {     return ((lr ? dp[c][lr - 1] : 0) - (rl ? dp[c][rl - 1] : 0) > 0);   }   int main() {     ios_base::sync_with_stdio(0);     cin >> s >> t;     s =  *  + s;     int n = (int)s.size();     int m = (int)t.size();     for (int i = 1; i < n; ++i) {       l[i] = l[i - 1];       if (s[i] == t[l[i]]) ++l[i];     }     for (int i = n - 1; i; --i) {       r[i] = r[i + 1];       if (s[i] == t[m - 1 - r[i]]) ++r[i];     }     if (l[n - 1] != m || r[1] != m) gd();     for (int i = 0; i < 26; ++i)       for (int j = 0; j < m; ++j) {         char c = i +  a ;         dp[i][j] = (j ? dp[i][j - 1] : 0) + (t[j] == c);       }     for (int i = 1; i < n; ++i) {       int rg = m - r[i];       int lg = l[i];       if (rg > lg || !check(lg, rg, s[i] -  a )) gd();     }     cout <<  Yes ;     return 0;   }   