Submission #258837

#	Time	Username	Problem	Language	Result	Execution time	Memory
258837		karma	은행 (IZhO14_bank)	C++14	100 / 100	103 ms	8696 KiB

bank

#include <bits/stdc++.h>
#define pb          emplace_back
#define ll          long long
#define fi          first
#define se          second
#define mp          make_pair
//#define int         int64_t

using namespace std;

const int N = 1 << 20 | 1;
const int inf = 1e9 + 1;
typedef pair<int, int> pii;

pii f[N];
int n, m, a[30], b[30];

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define Task        "test"
    if(fopen(Task".inp", "r")) {
        freopen(Task".inp", "r", stdin);
        freopen(Task".out", "w", stdout);
    }
    cin >> n >> m; a[n] = inf;
    for(int i = 0; i < n; ++i) cin >> a[i];
    for(int i = 0; i < m; ++i) cin >> b[i];
    fill(f, f + N, pii(-1, -1));
    f[0] = {0, 0};
    for(int i = 0; i < (1 << m); ++i) {
        if(f[i].fi >= n && f[i].se == 0) return cout << "YES", 0;
        if(f[i].fi == -1) continue;
        for(int j = 0; j < m; ++j) {
            if(i >> j & 1) continue;
            if(f[i].se + b[j] > a[f[i].fi]) continue;
            if(f[i].se + b[j] == a[f[i].fi]) {
                f[i ^ (1 << j)] = {f[i].fi + 1, 0};
                continue;
            }
            f[i ^ (1 << j)] = {f[i].fi, f[i].se + b[j]};
        }
    }
    cout << "NO";
}

Compilation message (stderr)

bank.cpp: In function 'int32_t 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]
         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]
         freopen(Task".out", "w", stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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