2014
02-10

# 两军交锋

1
10 20 30 100

100.000

mark：著名的ooxx题。。。不解释。

# include <stdio.h>
# include <math.h>

int main ()
{
int T ;
double a, b, c, d ;
scanf ("%d", &T) ;
while (T--)
{
scanf ("%lf%lf%lf%lf", &a, &b, &c, &d) ;
printf ("%.3lf\n", d/(a+b)*c) ;
}
return 0 ;
}

1. 第一句可以忽略不计了吧。从第二句开始分析，说明这个花色下的所有牌都会在其它里面出现，那么还剩下♠️和♦️。第三句，可以排除2和7，因为在两种花色里有。现在是第四句，因为♠️还剩下多个，只有是♦️B才能知道答案。

3. 题目需要求解的是最小值，而且没有考虑可能存在环，比如
0 0 0 0 0
1 1 1 1 0
1 0 0 0 0
1 0 1 0 1
1 0 0 0 0
会陷入死循环

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6. bottes vernies blanches

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