Submission #1025406

#	Time	Username	Problem	Language	Result	Execution time	Memory
1025406		ef10	Bank (IZhO14_bank)	C++17	71 / 100	1043 ms	8628 KiB

bank

// Source: https://usaco.guide/general/io

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

int N,M;
int A[21];
int B[21];
int dp[1<<20][2];

int main() {
	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 i = 0; i < (1<<M); i++) {
		for (int j = 0; j <= 1; j++) {
			dp[i][j] = -1;
		}
	}
	dp[0][0] = 0;
	for (int i = 0; i < (1<<M); i++) {
		dp[i][0]=0;
		for (int k = 0; k < M; k++) {
			if (i&(1<<k)) {
				dp[i][0] += B[k];
			}
		}
	}
	int ind;
	for (int i = 1; i <= N; i++) {
		ind = i % 2;
		int oi = (i+1) % 2;
		for (int j = 0; j < (1 << M); j++) {
			for (int k = 0; k < M; k++) {
				if (!(j&(1<<k))) continue;
				if (dp[j&~(1<<k)][ind] >= 0) {
					dp[j][ind] = dp[j&~(1<<k)][ind] + B[k];
				}
				if (dp[j&~(1<<k)][oi] < 0) continue;
				if (dp[j&~(1<<k)][oi] + B[k] == A[i]) {
					dp[j][ind] = 0;
				}
			}
		}
		for (int i = 0; i < (1<<M); i++) {
			dp[i][oi] = -1;
		}
	}
	for (int i = 0; i < (1<<M); i++) {
		if (dp[i][ind] >= 0) {
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
}

Compilation message (stderr)

bank.cpp: In function 'int main()':
bank.cpp:33:6: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
   33 |  int ind;
      |      ^~~

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