Submission #141550

#	Time	Username	Problem	Language	Result	Execution time	Memory
141550		meatrow	Bank (IZhO14_bank)	C++17	71 / 100	1081 ms	85700 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> dp[M];
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 = 0; mask < topkek; mask++) {
        for (int i = 0; i < m; i++) {
            if (mask & (1 << i)) {
                s[mask] += b[i];
            }
        }
        if (s[mask] < V) {
            g[s[mask]].push_back(mask);
        }
    }
    //random_shuffle(a.begin(), a.end());
    dp[0] = g[a[0]];
    for (int i = 0; i + 1 < n; i++) {
        for (int mask : dp[i]) {
            int cnt = 1 << (m - __builtin_popcount(mask));
            if (cnt < g[a[i + 1]].size()) {
                for (int kek = mask; kek < topkek; kek = (kek + 1) | mask) {
                    if (s[kek ^ mask] == a[i + 1]) {
                        dp[i + 1].push_back(kek);
                    }
                }
            } else {
                for (int kek : g[a[i + 1]]) {
                    if (!(kek & mask)) {
                        dp[i + 1].push_back(mask | kek);
                    }
                }
            }
            if (!dp[n - 1].empty()) {
                break;
            }
        }
    }
    if (dp[n - 1].empty()) {
        cout << "NO";
    } else {
        cout << "YES";
    }
    return 0; 
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:34:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (it1 < a.size() && it2 < b.size()) {
            ~~~~^~~~~~~~~~
bank.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (it1 < a.size() && it2 < b.size()) {
                              ~~~~^~~~~~~~~~
bank.cpp:68:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (cnt < g[a[i + 1]].size()) {
                 ~~~~^~~~~~~~~~~~~~~~~~~~

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