记录 40分求助

#include<bits/stdc++.h>
#define int long long
using namespace std;

signed main(){
	int k,n,e,d;
	scanf("%lld",&k);
	for (int i=1;i<=k;i++){
		scanf("%lld %lld %lld",&n,&e,&d);
		int sum=n-e*d+2;
		if (sum<=0){
			printf("NO\n");
			continue;
		}
		int tmp=sum*sum-4*n;
		if (tmp<0){
			printf("NO\n");
			continue;
		}
		tmp=sqrt(tmp);
		if (tmp>sum){
			printf("NO\n");
			continue;
		}
		printf("%lld %lld\n",(sum-tmp)/2LL,(sum+tmp)/2LL);
	}
	
	return 0;
}