This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int N = 20;
int n, m;
int a[N], b[N];
// pair<int, int> f[1 << N];
bool backtrack(int mask, int idx, int sum, int lb, int ub) {
if (idx == n) {
return true;
}
bool first = false;
for (int i = lb; i < ub; ++i) {
if ((mask >> i & 1) == 0) {
continue;
}
if (!first) {
first = true;
lb = i;
}
if (sum + b[i] < a[idx] && backtrack(mask | 1 << i, idx, sum + b[i], lb + (i == lb), ub - (i == ub - 1))) {
return true;
}
if (sum + b[i] == a[idx] && backtrack(mask | 1 << i, idx + 1, 0, lb + (i == lb), ub - (i == ub - 1))) {
return true;
}
}
return false;
}
// void solve() {
// for (int mask = 1; mask <= 1 << m; ++mask) {
// bool ok = false;
// for (int i = 0; i < m; ++i) {
// if ((mask >> i & 1) == 0) {
// continue;
// }
// int prev = mask ^ 1 << i;
// if (f[prev].first == -1) {
// continue;
// }
// if (f[prev].second + b[i] < a[f[prev].first]) {
// f[mask] = {f[prev].first, f[prev].second + b[i]};
// ok = true;
// break;
// } else if (f[prev].second + b[i] == a[f[prev].first]) {
// f[mask] = {f[prev].first + 1, 0};
// if (f[mask].first == n) {
// cout << "YES\n";
// return;
// }
// ok = true;
// break;
// }
// }
// if (!ok) {
// f[mask].first = -1;
// }
// }
// cout << "NO\n";
// }
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 0; i < n; ++i) {
cin >> a[i];
}
for (int i = 0; i < m; ++i) {
cin >> b[i];
}
// solve();
if (backtrack(0, 1, 0, 0, m)) {
cout << "YES\n";
} else {
cout << "NO\n";
}
}
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