Submission #1279634

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279634		ducanh0811	Bank (IZhO14_bank)	C++20	0 / 100	2 ms	1136 KiB

bank

#include <bits/stdc++.h>
#define MASK(i) (1 << (i))
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define REV(i, a, b) for (int i = (a), _b = (b); i >= _b; --i)
using namespace std;

int n, m;
#define MAXN 20
int a[MAXN];
int b[MAXN];
int f[MASK(MAXN)];
vector<int> cnt[1005];
bitset<MASK(MAXN)> dp[2];

void solve(){
    cin >> n >> m;
    FOR(i, 0, n - 1) cin >> a[i];
    FOR(i, 0, m - 1) cin >> b[i];
    FOR(mask, 1, MASK(m) - 1){
        int bit = __builtin_ctz(mask);
        f[mask] = f[mask ^ MASK(bit)] + b[bit];
        cnt[f[mask]].push_back(mask);
    }
    dp[1][0] = 1;
    FOR(i, 0, n - 1){
        dp[i&1].reset();
        FOR(mask, 0, MASK(m) - 1){
            if (!dp[!(i&1)][mask]) continue;
            for (int &x : cnt[a[i]]){
                if ((x | mask) == (x ^ mask)){
                    dp[i&1][mask ^ x] = 1;
                }
            }
        }
    }
    FOR(mask, 0, MASK(m) - 1){
        if (dp[(n-1)&1][mask]){
            cout << "YES";
            return;
        }
    }
    cout << "NO";
}

#define task "test"
int32_t main(){
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    solve();
    return 0;
}

Compilation message (stderr)

bank.cpp: In function 'int32_t main()':
bank.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bank.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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