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Posted by sherlockjk at 2009-07-22 16:49:45 on Problem 1844
#include <stdio.h>
int main(void)
{
	long n,i;
	
	scanf("%ld",&n);
	for (i=1;i<=2*n;i++){
		if((((i+1)*i)/2-n)%2==0&&(((i+1)*i)/2-n)>0){
			printf("%ld\n",i);
			break;
		}
	}
	return 0;
}

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