func_code_string: #include <bits/stdc++.h>   using namespace std;   int f[100][300] = {0};   int main() {     std::ios::sync_with_stdio(false);     string s1, s2;     cin >> s1 >> s2;     int t1 = 0, t2 = 0, q = 0;     for (int i = 0; i < s1.length(); i += 1) {       if (s1[i] ==  + )         t1++;       else         t1--;     }     for (int i = 0; i < s2.length(); i += 1) {       if (s2[i] ==  + )         t2++;       else if (s2[i] ==  - )         t2--;       else         q++;     }     int w = t1 - t2;     int dta = 20;     f[0][dta] = 1;     for (int i = 1; i <= q; i += 1) {       for (int j = -10; j <= 10; j += 1) {         f[i][j + dta] = f[i - 1][j + dta - 1] + f[i - 1][j + dta + 1];       }     }     double ans = f[q][w + dta] / double(1 << q);     cout << fixed << setprecision(12) << ans << endl;     return 0;   }   