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Submission #604069

# Submission time Handle Problem Language Result Execution time Memory
604069 2022-07-24T16:50:39 Z l_reho Stranded Far From Home (BOI22_island) C++14
10 / 100
 341 ms 45908 KB 
#include<bits/stdc++.h>
using namespace std;

#define ll long long

struct info{
	int node;
	ll people;
	
	bool operator <(const info &i) const{
		return people > i.people;
	}
	
};

int N, M;

vector<ll> A;
vector<bool> taken, vis;
vector<vector<int>> graph;
vector<ll> P;

void dfs(int curr){
	vis[curr] = true;
	
	vector<int> adj = graph[curr];
	
	P[curr] = A[curr];
	
	for(int a : adj){
		if(vis[a]) continue;
		dfs(a);
		
		P[curr] += P[a];
		
	}
	
	
	// cout<<curr<<" "<<P[curr]<<endl;
}
/*

8 7
8 8 7 7 7 6 5 4
1 2
2 3
1 4
4 5
1 6
6 7
7 8
 
 
*/
void solver(int curr, int p, vector<bool> &ans){
	vis[curr] = true;
	vector<int> adj = graph[curr];
	
	if((int)adj.size() == 1 && curr){
		if(P[curr] >= A[p]){
			ans[curr] = 1;
		}else{
			ans[curr] = 0;
		}
		return;
	}
	
	for(int a : adj){
		if(vis[a]) continue;
		
		if(curr){
			if(P[curr] >= A[p]){
				ans[curr] = 1;
			}else{
				ans[curr] = 0;
				continue;
			}
		}
		
		solver(a, curr, ans);
		
	}
	
}

void solve(){
	cin>>N>>M;
	
	A.assign(N, 0);
	P.assign(N, 0);
	
	graph.assign(N, vector<int>());
	vis.assign(N, false);
	
	for(ll &v:A) cin>>v;
	
	for(int i = 0; i < M; i++){
		int a, b;
		cin>>a>>b;
		a--;
		b--;
		graph[a].push_back(b);
		graph[b].push_back(a);
		
	}
	vector<bool> ans(N, 1);
	
	dfs(0);
	
	ll sum = accumulate(A.begin(), A.end(), 0LL);
	
	bool subtask1 = N <= 2000 && M <= 2000;
	
	if(subtask1){
		int last_color = N;
		
		for(int color = 0; color < last_color; color++){
			priority_queue<info> pq;
			// inizializzo la pq
			vector<int> adj = graph[color];
			
			taken.assign(N, false);
			taken[color] = true;
			
			for(int a : adj)
				pq.push({a, A[a]});
			
			ll total = A[color];
			
			while(!pq.empty()){
				info i = pq.top();
				
				pq.pop();
				
				int node = i.node;
				ll abitants = i.people;
				
				if(taken[node]) continue;
				
				taken[node] = true;
				
				if(abitants > total)
					break;
				
				if(ans[node]){
					total = sum;
					break;
				}
				
				total += abitants;
				vector<int> adj = graph[node];

				for(int a : adj){
					if(taken[a]) continue;
					pq.push({a, A[a]});
				}
				
			}	
			ans[color] = total == sum;
		}
		
		for(int i = 0; i < N; i++) cout<<ans[i];
		cout<<endl;
		return;
	}

	vis.assign(N, false);
	ans.assign(N, false);
	
	ans[0] = 1;
	
	solver(0, -1, ans);
	
	for(int i = 0; i < N; i++) cout<<ans[i];
	cout<<endl;
	
}

int main(){
	solve();
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 3 ms 468 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 314 ms 27148 KB Output is correct
4 Correct 249 ms 24560 KB Output is correct
5 Correct 336 ms 14288 KB Output is correct
6 Correct 310 ms 14716 KB Output is correct
7 Correct 341 ms 14800 KB Output is correct
8 Correct 332 ms 14848 KB Output is correct
9 Correct 313 ms 14548 KB Output is correct
10 Correct 243 ms 16176 KB Output is correct
11 Correct 221 ms 16208 KB Output is correct
12 Correct 265 ms 14764 KB Output is correct
13 Correct 217 ms 39608 KB Output is correct
14 Correct 241 ms 39636 KB Output is correct
15 Correct 313 ms 45908 KB Output is correct
16 Correct 226 ms 45420 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 330 ms 45620 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 323 ms 16848 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 3 ms 468 KB Output isn't correct
5 Halted 0 ms 0 KB -