标签：io amp as return hdu class ca include main
#include <cstdio>
int main(){
int n,m,x,y;
while(~scanf("%d%d%d%d",&n,&m,&x,&y)){
if(2*x==n&&2*y==m)puts("YES");else puts("NO");
}return 0;
}
标签：io amp as return hdu class ca include main
原文地址：http://www.cnblogs.com/forever97/p/4024497.html
