Submission #1047699

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047699		manhlinh1501	Bank (IZhO14_bank)	C++17	0 / 100	5 ms	45404 KiB

bank

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 21;

#define ALL(a) (a).begin(), (a).end()

int N, M;
int a[MAXN];
int b[MAXN];
bool dp[MAXN][1 << MAXN];
int sum[1 << MAXN];

namespace subtask {
    void solution() {
        for(int mask = 0; mask < (1 << M); mask++) {
            for(int j = 0; j < M; j++) {
                if(mask >> j & 1)
                    sum[mask] += b[j];
            }
        }
        if(N == 1) {
            for(int mask = 0; mask < (1 << M); mask++) {
                if(a[N] == sum[mask]) return cout << "YES", void(0);
            }
            cout << "NO";
            exit(0);
        }
        dp[0][0] = true;
        for(int i = 1; i <= N; i++) {
            for(int mask = 0; mask < (1 << M); mask++) {
                int nmask = ((1 << M) - 1) ^ mask;
                for(int smask = nmask; smask > 0; smask = (nmask & (smask - 1))) {
                    if(sum[smask] == a[i])
                        dp[i][mask ^ smask] |= dp[i - 1][mask];
                }
            }
        }
        for(int mask = 0; mask < (1 << M); mask++) {
            if(dp[N][mask]) return cout << "YES", void(0);
        }
        cout << "NO";
        exit(0);

    }
}

bool calc(int mask, int p, int g, int s) {
    bool &res = dp[p][mask];
    if(res != -1) return res;
    if(p == M) return res = false;
    if(g == N + 1) return res = true;
    if(s == a[g]) return calc(0, 0, g + 1, 0);
    res = 0;
    for(int i = p; i < M; i++) {
        if((mask >> i & 1) == 0 and s + b[i] <= a[g])
            res |= calc(mask ^ (1 << i), i + 1, g, s + b[i]);
    }
    return res;
}

signed main() {
#define TASK "code"

    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> N >> M;

    for(int i = 1; i <= N; i++) cin >> a[i];
    for(int i = 0; i < M; i++) cin >> b[i];

    if(accumulate(a + 1, a + N + 1, 0) > accumulate(b, b + M, 0))
        return cout << "NO", 0;
    memset(dp, -1, sizeof dp);
    cout << (calc(0, 0, 1, 0) ? "YES" : "NO");

    return (0 ^ 0);
}

Compilation message (stderr)

bank.cpp: In function 'bool calc(int, int, int, int)':
bank.cpp:49:12: warning: comparison of constant '-1' with boolean expression is always true [-Wbool-compare]
   49 |     if(res != -1) return res;
      |        ~~~~^~~~~
bank.cpp: In function 'int main()':
bank.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bank.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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