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超简单,思路很清晰的解法#include<stdio.h>
int main()
{
int s,i,sum=0;
scanf("%d",&s);
for(i=1;;i++)
{ sum+=i;
if(sum-s==0) break;
else if((sum-s)%2==0)
if((sum-s)/2<=sum&&(sum-s)/2>=1) break;
}
printf("%d\n",i);
}
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