Submission #753210

#	Time	Username	Problem	Language	Result	Execution time	Memory
753210		SLin25	Bank (IZhO14_bank)	C++14	100 / 100	147 ms	8624 KiB

bank

#include <bits/stdc++.h>
#include <iostream>
using namespace std;
typedef long long ll;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);

    int n, m; cin >> n >> m;
    int people[n];
    int banknotes[m];

    for (int i = 0; i < n; i++) {
        cin >> people[i];
    }

    for (int i = 0; i < m; i++) {
        cin >> banknotes[i];
    }

    int sums[(1<<m)];
    sums[0] = 0;
    int pref[n];
    for (int i = 0; i < n; i++) {
        pref[i] = people[i];
    }

    for (int i = 1; i < n; i++) {
        pref[i] += pref[i - 1];
    }

    for (int i = 1; i < (1 << m); i++) {
        int sb = 0;
        for (int j = 0; j < m; j++) {
            if (i&(1<<j)) sb++;
        }
        if (sb==1) {
            for (int j = 0; j < m; j++) {
                if (i&(1<<j)) sums[i] = banknotes[j];
            }
        } else {
            for (int j = 0; j < m; j++) {
                if (i&(1<<j)) {
                    sums[i] = sums[(1<<j)] + sums[i^(1<<j)];
                    break;
                }
            }
        }
    }
    int dp[(1<<m)];
    int np = 1e9;
    for (int i = 0; i < (1<<m); i++) dp[i] = np;
    dp[0] = 0;

    for (int i = 1; i < (1<<m); i++) {
        for (int j = 0; j < m; j++) {
            if (i&(1<<j) && dp[i^(1<<j)] != np && dp[i^(1<<j)] != n) {
                int targ = pref[dp[i^(1<<j)]] - sums[i^(1<<j)];
                if (targ == banknotes[j]) dp[i] = dp[i^(1<<j)]+1;
                else if (targ > banknotes[j]) dp[i] = dp[i^(1<<j)];
            }
        }
    }

    bool pass = false;
    for (int i = 0; i < (1<<m); i++) {
        if (dp[i] == n) {
            pass = true;
            break;
        }
    }

    cout << (pass?"YES":"NO") << '\n';


}

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