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这个错哪里了？？

Posted by D0153 at 2009-03-09 11:31:07 on Problem 1844 
#include<iostream>
using namespace std;
int main()
{
	int n,sum=0,i;
	cin>>n;
	for( i=0;sum<n||(sum%2==1);i++)
	{	
		sum+=i;
	}

	cout<<i-1<<endl;
	return 0;
}
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