你理解错题意了
> #include<stdio.h>
> #include<math.h>
> int main()
> {int i,n;
>  long test[10],N;
>  double root;
>  scanf("%d",&n);
>  for(i=0;i<n;i++)
>  {scanf("%ld",&test[i]);
>   root=(-1.0+sqrt(1+8.0*test[i]))/2;
>   N=long(root);
>   if((root-N)==0.0) printf("%ld\n",N);
>   else printf("%ld\n",long(test[i]-(N*(N+1.0)/2)));
>  }
> }