Submission #1244832

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244832		Sang	Bank (IZhO14_bank)	C++20	71 / 100	1093 ms	16456 KiB

bank

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

#define int long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, a, b) for (int i = (a), _b = (b); i >= _b; i--)
#define fi first
#define se second
#define pb push_back
#define ALL(a) (a).begin(), (a).end()
#define task "kbsiudthw"

typedef vector<int> vi;
typedef pair<int, int> ii;
typedef pair<int, ii> pii;

const int N = 1e5 + 5;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 2277;
const int M = (1 << 20) + 5;
int dp_before[M],dp_cur[M],a[25],b[25],sum[M];

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int n,m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 0; i < m; i++) cin >> b[i];
    for (int mask = 0; mask < (1 << m); mask++) {
        sum[mask] = 0;
        for (int i = 0; i < m; i++) 
            if (mask >> i & 1) sum[mask] += b[i];
    }
    for (int mask = 0; mask < (1 << m); mask++) 
        if (sum[mask] == a[1]) dp_before[mask] = 1;
    for (int i = 2; i <= n; i++) {
        for (int mask = 0; mask < (1 << m); mask++)
            for (int sub = mask; sub > 0; sub = (sub - 1) & mask) 
                if (dp_before[mask ^ sub] && sum[sub] == a[i]) dp_cur[mask] = 1;
            for (int mask = 0; mask < (1 << m); mask++) {
                dp_before[mask] = dp_cur[mask];
                dp_cur[mask] = 0;
            }
    }
    for (int mask = 0; mask < (1 << m); mask++)
        if (dp_before[mask]) {
            cout << "YES\n";
            return 0;
        }
    cout << "NO\n";
    return 0;
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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