题解：简单算下概率即可 #include<cstdio>int main(){int x, y;double p, q;int t;scanf("%d",&t);while(t--){scanf("%d %d %lf %lf", &x, &y, &p, &q);double tig = (x * p + y * p) * q + x * (1 - q);double wolf = (