Submission #1272551

#	Time	Username	Problem	Language	Result	Execution time	Memory
1272551		kiteyu	Bank (IZhO14_bank)	C++20	71 / 100	1094 ms	1644 KiB

bank

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
const int N=20;
int n,m,a[N+5],b[N+5],d[N+5],qe[N+5][(1<<N)];
bool f[(1<<N)];
vector<int>g[N+5];

bool cmp(int x,int y){
    return (int)g[x].size()>(int)g[y].size();
}

int main(){
//    freopen("bank.in","r",stdin);
//    freopen("bank.out","w",stdout);
    cin>>n>>m;
    for(int i=0;i<n;++i) cin>>a[i];
    for(int i=0;i<m;++i)cin>>b[i];

    for(int i=0;i<n;++i){
         //   cout<<i<<":\n";
        for(int mask=1;mask<(1<<m);++mask){
            int s=0;
            for(int j=0;j<m;++j)
                if(((mask>>j)&1)) s+=b[j];
            if(s==a[i]){
                g[i].push_back(mask);
                //cout<<mask<<' ';
            }
        }
        //cout<<'\n';
    }
    vector<int>v(n);
    iota(v.begin(),v.end(),0);
    sort(v.begin(),v.end(),cmp);
//    for(int i:v) cout<<i<<' ';
//    cout<<'\n';
    qe[0][d[0]++]=0;
    for(int i=0;i<n;++i){
        memset(f,0,sizeof(f));
        //cout<<i<<":\n";
        for(int j=0;j<d[i];++j){
            //cout<<qe[i][j]<<' ';
            for(int mask:g[v[i]]){
                if(!(qe[i][j]&mask)&&!f[qe[i][j]^mask]){
                    f[qe[i][j]^mask]=1;
                    qe[i+1][d[i+1]++]=(qe[i][j]^mask);
                    if(i==n-1) return cout<<"YES",0;
                }
            }
        }
        //cout<<'\n';
    }
    cout<<"NO";
    return 0;
}

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