Submission #978955

#TimeUsernameProblemLanguageResultExecution timeMemory
978955SkaBank (IZhO14_bank)C++14
0 / 100
1 ms348 KiB
#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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