func_code_string: #include <bits/stdc++.h>   using namespace std;   int read() {     int q = 0;     char ch =    ;     while (ch <  0  || ch >  9 ) ch = getchar();     while (ch >=  0  && ch <=  9 ) q = q * 10 + ch -  0 , ch = getchar();     return q;   }   const int N = 100005;   double P[N][110], ans;   int n, m, a[N], b[N];   double C(int d, int u) {     if (d < u || d < 0 || u < 0) return 0;     double ans = 1;     for (register int i = d - u + 1; i <= d; ++i) ans *= i;     for (register int i = 1; i <= u; ++i) ans /= i;     return ans;   }   int main() {     n = read();     for (register int i = 1; i <= n; ++i)       a[i] = b[i] = read(), P[i][a[i]] = 1, ans += (a[i] == 0);     m = read();     while (m--) {       int x = read(), y = read(), k = read();       ans -= P[x][0];       for (register int i = 0; i <= a[x]; ++i) {         double tmp = 0, all = C(b[x], k);         for (register int j = 0; j <= k; ++j)           tmp += P[x][i + j] * C(b[x] - i - j, k - j) * C(i + j, j);         P[x][i] = tmp / all;       }       ans += P[x][0], b[x] -= k, b[y] += k;       printf( %.10lf n , ans);     }     return 0;   }   