Submission #1073227

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073227		vjudge1	Bank (IZhO14_bank)	C++17	0 / 100	2 ms	348 KiB

bank

#include <bits/stdc++.h>
 
using namespace std;
 
const int Z = 20;
int N, M, A[Z], B[Z];
bool visited[Z][1 << Z];
vector<int> S[Z];
bool ans = false;
 
void backtrack(int i, int state) {
	if (i == N) {
		ans = true;
                return;
	}
 
	if (visited[i][state]) return;
	visited[i][state] = true;
 
	for (int e = 0; e < S[i].size(); e++) {
		int s = S[i][e];
		if (state & s) continue;
		backtrack(i + 1, state | s);
	}
}
int main() {
     ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

        freopen("bank.in","r",stdin);
        freopen("bank.out","w",stdout);

    cin >> N >> M;
    for (int i = 0; i < N; i++) cin >> A[i];
    for (int i = 0; i < M; i++) cin >> B[i];
 
	for (int state = 0; state < (1 << M); state++) {
		int sum = 0;
		for (int i = 0; i < M; i++) if (state & (1 << i)) sum += B[i];
		for (int i = 0; i < N; i++) if (sum == A[i]) S[i].push_back(state);
	}
 
	backtrack(0, 0);
 
	if (ans) cout << "YES\n";
        else cout << "NO\n";
 
	return 0;
}

Compilation message (stderr)

bank.cpp: In function 'void backtrack(int, int)':
bank.cpp:20:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  for (int e = 0; e < S[i].size(); e++) {
      |                  ~~^~~~~~~~~~~~~
bank.cpp: In function 'int main()':
bank.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen("bank.in","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
bank.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen("bank.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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