Submission #856187

#	Time	Username	Problem	Language	Result	Execution time	Memory
856187		ThylOne	Bank (IZhO14_bank)	C++14	71 / 100	1018 ms	45576 KiB

bank

#include<bits/stdc++.h>

using namespace std;
int n,m;
vector<int> salaries;
vector<int> billets;
#define BS bitset
bool mem[22][(1<<21)];
void initMem(){
	for(int i=0;i<22;i++){
		for(int j=0;j<(1<<21);j++){
			mem[i][j]=false;
		}
	}
}
bool solved(int pos,BS<20> bs){
	if(mem[pos][bs.to_ulong()]){
		return false;
	}
	mem[pos][bs.to_ulong()]=true;
	if(pos==n)return true;
	vector<int> index;
	for(int i=0;i<m;i++){
		if(!bs[i]){
			index.push_back(i);
		}
		
	}
	const int S = int(index.size());
	for(int i=0;i<(1<<S);i++){
		BS<20> bs2 = i;
		int sum=0;
		for(int j=0;j<S;j++){
			if(bs2[j]){
				sum+=billets[index[j]];
			}
			if(sum>salaries[pos])break;
		}
		
		if(sum==salaries[pos]){
			BS<20> cbs=bs;
			for(int j=0;j<S;j++){
				if(bs2[j]){
					cbs[index[j]]=1;
				}
				
			}
			if(solved(pos+1,cbs)){
					return true;
				}
		}
	}
	
	
	return false;
}
signed main(){
	initMem();
	cin>>n>>m;
	salaries.resize(n);
	billets.resize(m);
	for(int i=0;i<n;i++){
		cin>>salaries[i];
	}
	for(int i=0;i<m;i++){
		cin>>billets[i];
	}
	sort(billets.begin(),billets.end());
	
	if(solved(0,0)){
		cout<<"YES\n";
	}else{
		cout<<"NO\n";
	}
	return 0;
}

• Subtask 1: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29