Submission #919071

#	Time	Username	Problem	Language	Result	Execution time	Memory
919071		penguin133	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	2 ms	664 KiB

eastereggs

#include <bits/stdc++.h>
using namespace std;
 #include "grader.h"
//#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
 
int S[1005], back[1005], c = 1;
vector <int> adj[1005];
 
void dfs(int x, int par){
	S[x] = c++;
	for(auto i : adj[x])if(i != par)dfs(i, x);
}
 
int findEgg (int N, vector < pair < int, int > > bridges)
{
	c = 1;
    for(int i = 1; i <= N; i++)adj[i].clear();
    for(auto [i, j] : bridges)adj[i].push_back(j), adj[j].push_back(i);
    dfs(1, -1);
    for(int i = 1; i <= N; i++)back[S[i]] = i;
    int lo = 1, hi = N, ans = hi;
  
    while(lo < hi){
		int mid = (lo + hi) >> 1;
		vector <int> v;
		for(int i = 1; i <= mid; i++)v.push_back(back[i]);
		if(query(v))ans = mid, hi = mid - 1;
		else lo = mid + 1;
	}
    return back[ans];
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20