Submission #1127417

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127417		FucKanh	Bank (IZhO14_bank)	C++20	100 / 100	162 ms	33264 KiB

bank

#include<bits/stdc++.h>
#define ll long long
#define int ll
#define pii pair<int,int>

using namespace std;

int n,m;
int w[1<<21], pos[1<<21], ok[1<<21];
int a[30], b[30], s[30];

void solve() {
    cin >> n >> m;
    if (n > m) {
        cout << "NO";
        return;
    }

    memset(pos,-1,sizeof(pos));
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= n; i++) s[i] = s[i-1] + a[i];
    for (int i = 1; i <= m; i++) {
        cin >> b[i];
        if (b[i] <= a[1]) ok[1<<i-1] = 1;
    }

    for (int state = 1; state < (1<<m); state++) {
        for (int i = 0; i < m; i++) {
            if ((state & (1<<i))==0) continue;
            w[state] += b[i+1];
        }
        if (w[state] <= s[n]) pos[state] = lower_bound(s + 1, s + 1 + n, w[state]) - s;
    }

    for (int state = 1; state < (1<<m); state++) {
//        cerr << bitset<6>(state) << ": " << ok[state] << " " << w[state] << " : " << pos[state] << endl;
        if (ok[state] == 0) continue;
        if (pos[state] == n && w[state] == s[n]) {
            cout << "YES";
            return;
        }
        for (int i = 0; i < m; i++) {
            if (state & (1<<i)) continue;
//            if ((pos[state ^ (1<<i)] == pos[state] || pos[state ^ (1<<i)] == pos[state] + 1) && w[state ^ (1<<i)] <= s[pos[state ^ (1<<i)]]) ok[state ^ (1<<i)] = 1;
            if (pos[state ^ (1<<i)] == pos[state]) ok[state ^ (1<<i)] = 1;
            else if (pos[state ^ (1<<i)] == pos[state] + 1 && w[state] == s[pos[state]]) ok[state ^ (1<<i)] = 1;
        }
    }
    cout << "NO";
}

signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    solve();
    return 0;
}

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