Submission #1155339

#	Time	Username	Problem	Language	Result	Execution time	Memory
1155339		eudhsyf	Bank (IZhO14_bank)	C++20	100 / 100	111 ms	16852 KiB

bank

/*
   Author : 
*/
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define fi first
#define se second
#define pii pair<int, int>
#define pb push_back
#define eb emplace_back
#define task "file"
#define int ll
int a[21], b[21], n, m;
int dp[(1 << 20) + 5], lst[(1 << 20) + 5];
signed main ()
{
    if(fopen(task".inp", "r"))
    {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    for (int i = 0; i < m; i++) {
        cin >> b[i];
    }
    memset(dp, -1, sizeof(dp));
    memset(lst, -1, sizeof(lst));
    dp[0] = 0; 
    lst[0] = 0;
    for (int mask = 1; mask < (1 << m); mask ++) {
        for (int j = 0; j < m; j++) {
            if(mask & (1 << j)) {
                int pre = mask & ~(1 << j); 
                if(dp[pre] == -1) continue;
                if(lst[pre] + b[j] == a[dp[pre]]) {
                    dp[mask] = dp[pre] + 1;
                    lst[mask] = 0;
                }
                else if(lst[pre] + b[j] < a[dp[pre]]) {
                    dp[mask] = dp[pre];
                    lst[mask] = lst[pre] + b[j];
                }
            }
        }
        if(dp[mask] == n) {
            cout << "YES";
            return 0;
        }
    }
    cout << "NO";
    return 0;
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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