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yiyiyi4321的解法说明

Posted by level at 2006-08-06 21:15:40 on Problem 1844
1+2+3+4+5+6+7+8+9+10....因为在A中少加一数X(只能有+,-不加必减)相当于A-2X=B;
要让X存在.A-B必为偶数.只要有一数A能减去给出的数B的结果C为偶数的话就一定可了.
#include<iostream.h>
void main()
{
	int n,i,sum;
	cin>>n;
	sum=0;
	for(i=1;sum<n||((sum-n)%2==1);i++)//小于||相差为奇数
		sum+=i;
	cout<<i-1<<endl;
}

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