Submission #1269472

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269472		quangminh412	Bank (IZhO14_bank)	C++17	100 / 100	100 ms	16852 KiB

bank

/*
  Ben Watson

  Quang Minh MasterDDDDD
*/

#include <bits/stdc++.h>
using namespace std;

#define ll long long

const string name = "test";

void solve();
signed main()
{
    if (fopen((name + ".inp").c_str(), "r"))
    {
        freopen((name + ".inp").c_str(), "r", stdin);
        freopen((name + ".out").c_str(), "w", stdout);
    }
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    solve();

    return 0;
}

// main program
const int maxn = 21;
const int maxbit = (1 << maxn);

int cover[maxbit], leftover[maxbit];
int a[maxn], b[maxn];
int n, m;

void solve()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    for (int i = 1; i <= m; i++)
        cin >> b[i];

    memset(cover, -1, sizeof(cover));
    memset(leftover, -1, sizeof(leftover));
    cover[0] = 0;
    leftover[0] = 0;
    for (int mask = 0; mask < (1 << m); mask++)
    {
        for (int i = 0; i < m; i++)
        {
            if (!(mask >> i & 1))
                continue;
            int prev = (mask ^ (1 << i));
            if (cover[prev] == -1)
                continue;

            int new_leftover = leftover[prev] + b[i + 1];
            int idx = cover[prev] + 1;
            if (new_leftover < a[idx])
            {
                cover[mask] = cover[prev];
                leftover[mask] = new_leftover;
            } else
            if (new_leftover == a[idx])
            {
                cover[mask] = idx;
                leftover[mask] = 0;
            }
        }
        if (cover[mask] == n)
        {
            cout << "YES\n";
            return;
        }
    }
    cout << "NO\n";
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen((name + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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