Submission #744934

#	Time	Username	Problem	Language	Result	Execution time	Memory
744934		josanneo22	Stranded Far From Home (BOI22_island)	C++17	0 / 100	153 ms	23836 KiB

island

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

#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define fi first
#define se second 
#define int long long
const int maxn = 2e5 + 50;
vector<vector<int>> adj(maxn);
vector<int>dp(maxn), s(maxn), vis(maxn), vis1(maxn);
void dfs(int u) {
	dp[u] = s[u];
	vis[u] = 1;
	for (auto& v : adj[u]) {
		if (!vis[v]) {
			dfs(v);
			dp[u] += dp[v];
		}
	}
}
void dfs1(int u) {
	vis1[u] = 1;
	for (auto& v : adj[u]) {
		if (!vis1[v]) {
			if (dp[v]>=s[u]) dp[v] = dp[u];
			dfs(v);
		}
	}
}
signed main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n, m; cin >> n >> m;
	for (int i = 0; i < n; i++) cin >> s[i];
	int save = accumulate(s.begin(), s.end(), 0LL);
	for (int i = 0; i < m; i++) {
		int u, v; cin >> u >> v;
		u--; v--;
		adj[u].pb(v); adj[v].pb(u);
	}
	dfs(0); dfs1(0);
	for (int i = 0; i < n; i++) {
		cout << (dp[i] == save);
	}
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35