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用数学的方法为什么WA??

Posted by RUNSLOWLY at 2008-05-17 15:42:11 on Problem 1019
#include<stdio.h>
#include<math.h>
void main()
{
	int i,n,k,sum;
	scanf("%d",&k);
	while(k--)
	{
		scanf("%d",&n);
		i=(int)sqrt(2*n);
		if(i*(i+1)/2-n<0)
			i++;
		sum=i-i*(i+1)/2+n;
		printf("%d\n",sum);
	}
}

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