#include<bits/stdc++.h>
using namespace std;
int n,b,res;
int a[250+5];
int best=10000000000;
void solve(int num,int sum){
	if(sum>=b && sum<best){
		best=sum;
	}
	if(num==n || sum>=best){
		return;
	}
	solve(num+1,sum+a[num]);
	solve(num+1,sum);
	res=best-b;
}
int main()
{
	cin>>n>>b;
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	solve(0,0);
	cout<<res;
	return 0;
}

提交记录

#include <iostream>
using namespace std;
int a[251];
int n,b;
int best=1500000;
void f(int num,int sum){
	if(sum>=b&&sum<best) best=sum;
	if(num==n||sum>=best) return;
	f(num+1,sum+a[num]);
	f(num+1,sum);
}
int main()
{
	cin>>n>>b;
	for(int i=0;i<n;i++)
		cin>>a[i];
	f(0,0);
	cout<<best-b;
    return 0;
}