int n,L;
int a[N];
bool check(int mid,int x){
	int ans = (L/2)*(mid-1)*(L-(L/2));
	return ans >= x;
}
void solve(){
	cin>>n>>L;For(i,1,n) cin>>a[i];
	For(i,1,n){
		int l=1,r=2e5+5,mid;
		while(l+5<r){
			mid=(l+r)>>1;
			if(check(mid,a[i]))r=mid;
			else l=mid;
		}int out=0;
		For(j,l,r) if(check(j,a[i])){
			out=j-1;break;
		}
		cout<<out<<endl;
	}
}

蒟蒻写了二分不会判断-1，请问这个写法对吗？-1 咋判