PE 006 Sum square difference

题目链接：https://projecteuler.net/problem=6

按题意模拟即可

代码：

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
	//freopen("in.txt","r",stdin);
	//freopen("out.txt","w",stdout);
	ll A=0,B=0;
	for(int i=1;i<=100;i++)
	{
		A+=1LL*i*i;
		B+=i;
	}
	B*=B;
	printf("%lld\n",B-A);
	return 0;
}