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Submission #791344

# Submission time Handle Problem Language Result Execution time Memory
791344 2023-07-24T02:53:31 Z jamezzz Easter Eggs (info1cup17_eastereggs) C++17
100 / 100
 20 ms 384 KB 
#include <bits/stdc++.h>
#include "grader.h"
using namespace std;

#define maxn 520

#define pb push_back
#define sz(x) ((int)x.size())
typedef pair<int,int> ii;

int mark[maxn],take[maxn];
vector<int> AL[maxn];

void dfs(int u,int p,vector<int> &s,int &t){
	if(mark[u])s.pb(u);
	else if(t>0)s.pb(u),--t;
	else return;
	for(int v:AL[u]){
		if(v==p)continue;
		dfs(v,u,s,t);
	}
}

int findEgg(int N,vector<ii> bridges){
	memset(mark,0,sizeof mark);
	for(int i=1;i<=N;++i)AL[i].clear();
    for(auto[u,v]:bridges){
		AL[u].pb(v);
		AL[v].pb(u);
	}
	while(true){
		int rem=0;
		for(int i=1;i<=N;++i){
			if(!mark[i])++rem;
		}
		if(rem==1)break;
		rem/=2;
		vector<int> v;
		dfs(1,-1,v,rem);
		int res=query(v);
		for(int i:v)take[i]=1;
		for(int i=1;i<=N;++i){
			if(res==0&&take[i]==1)mark[i]=1;
			else if(res==1&&take[i]==0)mark[i]=1;
		}
		for(int i:v)take[i]=0;
	}
	for(int i=1;i<=N;++i){
		if(!mark[i])return i;
	}
}

Compilation message

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:51:1: warning: control reaches end of non-void function [-Wreturn-type]
   51 | }
      | ^

Subtask #1
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Number of queries: 4
2 Correct 1 ms 208 KB Number of queries: 4
3 Correct 1 ms 208 KB Number of queries: 4
4 Correct 1 ms 208 KB Number of queries: 4

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 356 KB Number of queries: 8
2 Correct 13 ms 336 KB Number of queries: 9
3 Correct 20 ms 336 KB Number of queries: 9
4 Correct 18 ms 336 KB Number of queries: 9

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 384 KB Number of queries: 9
2 Correct 18 ms 352 KB Number of queries: 9
3 Correct 19 ms 336 KB Number of queries: 9
4 Correct 19 ms 352 KB Number of queries: 9