Submission #360477

#	Time	Username	Problem	Language	Result	Execution time	Memory
360477		Seanliu	Bank (IZhO14_bank)	C++14	52 / 100	1077 ms	8556 KiB

bank

#include <iostream>
#include <algorithm>
using namespace std;

const int maxN = 21;
int N, M, a[maxN], b[maxN], dp[maxN][1 << maxN], has[maxN], head, cnt;

bool dfs(int now, int cursum, int tgt, int &curmask, int &ind){
    //cout << "running dfs(" << now << ", " <<cursum << ", " << tgt << ", " << curmask << ", " << ind << ")\n";
    if(cursum == tgt){
        return dp[ind - 1][curmask];
    }
    if(now >= head) return false;
    if(tgt - cursum < b[has[now]]) return false;
    curmask ^= (1 << has[now]);
    if(dfs(now + 1, cursum + b[has[now]], tgt, curmask, ind)){
        curmask ^= (1 << has[now]);
        return true;
    }
    curmask ^= (1 << has[now]);
    if(dfs(now + 1, cursum, tgt, curmask, ind)){
        return true;
    }
    return false;
}

int main(){
    cin >> N >> M;
    for(int i = 1; i <= N; i++) cin >> a[i];
    for(int i = 0; i < M; i++) cin >> b[i];
    sort(b, b + M);
    sort(a, a + N);
    for(int m = 0; m < (1 << M); m++) dp[0][m] = 1;
    for(int i = 1; i <= N; i++){
        bool f = 0;
        for(int m = (1 << M) - 1; m >= 0; m--){
            //cout << "Running " << i << " " << m << endl;
            for(int j = 0; j < M; j++) if(!(((m >> j) & 1)) && (!dp[i][m ^ (1 << j)])) {
                dp[i][m] = 0;
                break;
            }
            head = 0;
            cnt = 0;
            for(int j = 0; j < M; j++) if(((m >> j) & 1)) has[head++] = j;
            dp[i][m] = dfs(0, 0, a[i], m, i);
            //cout << "done" << endl;
            f |= dp[i][m];
        }
        if(!f){
            cout << "NO\n";
            return 0;
        }
    }
    for(int m = 0; m < (1 << M); m++) if(dp[N][m]){
        cout << "YES\n";
        return 0;
    }
    cout << "NO\n";
}

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