Submission #243021

#	Time	Username	Problem	Language	Result	Execution time	Memory
243021		Exile_2k4	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	26 ms	412 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
 
using namespace std;
 
const int sz = 1000;
 
#define pii pair<int,int>
 
vector<int> g[sz], call;
int need, now;
 
bool exist[sz], nxt[sz];
 
void dfs(int p,int u){
	if(now==need) return;
	if(exist[u]) ++now;
	call.push_back(u);
	for(auto v:g[u]) if(v!=p) dfs(u,v);
}

//int query(vector<int> e){
//	for(auto v:e) cout << v << " ";
//	cout << endl;
//	int verd;
//	cin >> verd;
//	return verd;
//}
 
int findEgg(int N, vector<pii> bridges){
	int cnt = N;
	for(int i=1;i<=N;++i) g[i].clear();
	for(int i=0;i<N-1;++i){
		g[bridges[i].first].push_back(bridges[i].second);
		g[bridges[i].second].push_back(bridges[i].first);
	}
	memset(exist,true,sizeof(exist));
	
	while(cnt!=1){
		need = (cnt+1)/2, now = 0;
		call.clear();
		dfs(1,1);
		if(query(call)){
			memset(nxt,false,sizeof(nxt));
			for(auto v:call) nxt[v] = exist[v];
            for(int i=1;i<=N;++i) exist[i] = nxt[i];
			cnt = now;
		}else{
			for(auto v:call) exist[v] = 0;
			cnt -= now;
		}
	}
	for(int i=1;i<=N;++i) if(exist[i]) return i;
}

//signed main(){
//	int n;
//	cin >> n;
//	vector<pii> e(n-1);
//	for(int i=0;i<n-1;++i) cin >> e[i].first >> e[i].second;
//	cout << findEgg(n,e);
//}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:54:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 20 / 20