Submission #798579

#	Time	Username	Problem	Language	Result	Execution time	Memory
798579		cryan	Bank (IZhO14_bank)	C++17	71 / 100	1072 ms	112532 KiB

bank

// oh, these hills, they burn so bright / oh, these hills, they bring me life
#include "bits/stdc++.h"
using namespace std;

using ll = long long;
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x.size())
#define inf 1000000010
#define linf 0x3f3f3f3f3f3f3f3f
#define mp make_pair
#define f first
#define s second
#define pi pair<int, int>
#ifdef __INTELLISENSE__
#include "/mnt/c/yukon/pp.hpp"
#endif
#ifndef LOCAL
#define endl "\n"
#else
#include "/mnt/c/yukon/pp.hpp"
#endif

int main() {
	cin.tie(0)->sync_with_stdio(0);
	int n, m;
	cin >> n >> m;

	vector<int> a(n + 1);
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}

	vector<int> b(m);
	for (int i = 0; i < m; i++) {
		cin >> b[i];
	}

	vector<vector<vector<int>>> combos(n + 1);

	for (int i = 1; i <= n; i++) {
		vector<vector<vector<int>>> pp(a[i] + 1);
		pp[0].push_back(vector<int>());

		for (int bank = 0; bank < m; bank++) {
			for (int val = 1; val <= a[i]; val++) {
				if (val - b[bank] >= 0) {
					int bruhmoment = sz(pp[val]);

					for (auto kk : pp[val - b[bank]]) {
						if (find(all(kk), bank) == kk.end()) {
							pp[val].push_back(kk);
						}
					}
					for (int l = bruhmoment; l < sz(pp[val]); l++) {
						pp[val][l].push_back(bank);
					}
				}
			}
		}

		combos[i] = pp[a[i]];
	}

	vector<vector<bool>> dp(n + 1, vector<bool>(1 << m, false));

	dp[0][0] = 1;

	for (int i = 1; i <= n; i++) {
		for (auto &k : combos[i]) {
			vector<int> pos;
			int wahhhh = 0;
			for (int gg = 0; gg < m; gg++) {
				if (find(all(k), gg) == k.end()) {
					pos.push_back(gg);
				} else {
					wahhhh += (1 << gg);
				}
			}

			for (int mask = 0; mask < (1 << sz(pos)); mask++) {
				int now = wahhhh;
				for (int clown = 0; clown < sz(pos); clown++) {
					if ((1 << clown) & mask) {
						now += (1 << pos[clown]);
					}
				}

				dp[i][now] = dp[i][now] || dp[i - 1][now - wahhhh];
				//cout << i << ' ' << bitset<6>(mask) << ": " << dp[i][mask] << endl;
				//cout << "REF: " << i - 1 << ' ' << bitset<6>(before) << endl;
				if (i == n && dp[i][now]) {
					cout << "YES" << endl;
					return 0;
				}
			}
		}
	}
	cout << "NO" << endl;
}

// don't get stuck on one approach
// question bounds
// flesh out your approach before implementing o.o
// math it out
// ok well X is always possible, how about X + 1 (etc.)

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