Submission #141557

#	Time	Username	Problem	Language	Result	Execution time	Memory
141557		meatrow	Bank (IZhO14_bank)	C++17	100 / 100	277 ms	17796 KiB

bank

#pragma GCC optimize("O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,tune=native")
//#pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int M = 20;
const int N = 1 << M;
const int V = 1001;

vector<int> g[V];
vector<int> lst[M];
int dp[M][N];
int s[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<int> a(n), b(m);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    for (int i = 0; i < m; i++) {
        cin >> b[i];
    }
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    int it1 = 0, it2 = 0;
    while (it1 < a.size() && it2 < b.size()) {
        if (a[it1] == b[it2]) {
            a.erase(a.begin() + it1);
            b.erase(b.begin() + it2);
            continue;
        }
        if (a[it1] < b[it2]) {
            it1++;
        } else {
            it2++;
        }
    }
    if (a.empty()) {
        cout << "YES";
        return 0;
    }
  	n = a.size();
  	m = b.size();
    int topkek = 1 << m;
    for (int mask = 1; mask < topkek; mask++) {
        int cnt = 0;
        for (int i = 0; i < m; i++) {
            if (mask & (1 << i)) {
                s[mask] += b[i];
                cnt++;
            }
        }
        if (s[mask] < V) {
            g[s[mask]].push_back(mask);
        }
        if (s[mask] == a[0]) {
            dp[0][mask] = 1;
        }
        lst[cnt].push_back(mask);
    }
    for (int i = 1; i < n; i++) {
        for (int cnt = i * 2; cnt <= m; cnt++) {
            for (int mask : lst[cnt]) {
                if (!dp[i - 1][mask]) {
                    continue;
                }
                for (int kek = mask; kek < topkek; kek = (kek + 1) | mask) {
                    if (s[mask ^ kek] == a[i]) {
                        dp[i][kek] = 1;
                    }
                }
            }
        }
    }
    for (int i = 0; i < topkek; i++) {
        if (dp[n - 1][i]) {
            cout << "YES";
            return 0;
        }
    }
    cout << "NO";
    return 0; 
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:35:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (it1 < a.size() && it2 < b.size()) {
            ~~~~^~~~~~~~~~
bank.cpp:35:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (it1 < a.size() && it2 < b.size()) {
                              ~~~~^~~~~~~~~~

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