BZOJ 2299 向量

归纳所有操作，然后==裴蜀定理判判。

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
long long t,x,y,a,b,d;
long long gcd(long long a,long long b)
{
    if (b==0) return a;
    return gcd(b,a%b);
}
bool judge(long long x,long long y)
{
    if ((x%d==0) && (y%d==0)) return true;
    return false;
}
int main()
{
    scanf("%lld",&t);
    for (long long i=1;i<=t;i++)
    {
        scanf("%lld%lld%lld%lld",&a,&b,&x,&y);
        d=gcd(2*a,2*b);
        if ((judge(x,y)) || (judge(x+a,y+b)) || (judge(x+b,y+a)) || (judge(x+a+b,y+a+b)))
            printf("Y\n");
        else printf("N\n");
    }
    return 0;
}