func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( O3 )   using namespace std;   long long mod = 1e9 + 7;   vector<long long> g[27];   signed main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     string s1, s2;     cin >> s1 >> s2;     long long n1 = s1.size(), n2 = s2.size(), i, j;     for (i = 0; i < n1; ++i) g[s1[i] -  a ].push_back(i);     long long cnt = 1, prev = -1, it, sz;     for (i = 0; i < n2; ++i) {       j = s2[i] -  a ;       sz = g[j].size();       if (sz == 0) return cout << -1, 0;       it = upper_bound(g[j].begin(), g[j].end(), prev) - g[j].begin();       if (it == sz) it = 0, ++cnt;       prev = g[j][it];     }     cout << cnt <<   n ;     return 0;   }   