题目链接http://codeforces.com/problemset/problem/675/A
一道大水题
#include<iostream>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<queue>
#include<cstdlib>
#define ll long long
using namespace std;
int main()
{
ll a,b,c;
while(cin>>a>>b>>c)
{
if(c==0)
{
if(a==b)cout<<"YES"<<endl;
else cout<<"NO"<<endl;
continue;
}
if((b-a)%c==0&&(b-a)/c>=0)cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
return 0;
}