func_code_string: #include <bits/stdc++.h>   using namespace std;   string s, t;   int dp[5005][5005];   int get(int i, int j) {     if (dp[i][j] != -1) return dp[i][j];     if (i >= s.size() or j >= t.size()) return 0;     int ret = get(i, j + 1);     if (s[i] == t[j]) ret = (ret + 1 + get(i + 1, j + 1)) % 1000000007;     return dp[i][j] = ret;     ;   }   int main() {     for (int i = 0; i < 5005; ++i)       for (int j = 0; j < 5005; ++j) dp[i][j] = -1;     cin >> s >> t;     long long ret = 0;     for (int i = 0; i < s.size(); ++i) ret = (ret + get(i, 0)) % 1000000007;     cout << ret << endl;   }   