昨天做过一样的题:

平方和公式:n*(n+1)*(2n+1)/6


#include<cstdio>
#include<cstdlib>
#include<iostream>
using namespace std;
int a[],num;
int b[];
int _S()
{
char c=getchar();int s=;
while(c<''||c>'') c=getchar();
while(c>=''&&c<=''){s=s*+c-'';c=getchar();}
return s;
}
void _db()
{
for(int i=;i<=;i++)
a[i]=(i+)*i/;
for(int i=;i<=;i++)
b[i]=i*(i+)*(*i+)/;
return ;
}
void _get(int v)
{
int tmp,ans;
for(int i=;i<=;i++)
if(a[i]<=v) tmp=i;//当然也可以用二分查找或者lower_bound
ans=b[tmp];
ans+=(v-a[tmp])*(tmp+);
printf("%d %d\n",v,ans);
return ;
}
int main()
{
_db();
int T,n,x;
T=_S();
while(T--){
while(true){
x=_S();
if(x==) break;
_get(x);
}
if(T) printf("\n");
}
return ;
}

 

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