Submission #61643

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
61643	2018-07-26 08:43:06	huynhsmd	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	46 ms	3056 KiB

eastereggs

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#include<bits/stdc++.h>
#include "grader.h"
#define pb push_back
#define fi first
#define se second
using namespace std;
typedef pair <int , int > ii;
const int N = 1e5 + 5;
int arr[N], cnt = 0;
vector < int > adj[N], ask;
void dfs(int u, int p){
  arr[++cnt] = u;
  for(int v : adj[u]) if(v != p) dfs(v, u);
}
int findEgg(int N, vector < ii > bridges){
  int n = N;
  for(int i = 1; i <= n; ++ i) adj[i].clear();
  for(ii i : bridges) adj[i.fi].pb(i.se), adj[i.se].pb(i.fi);
  dfs(1, 1);
  int l = 1, r = n, res;
  while(l < r){
    int mid = l + r >> 1;
    ask.clear();
    for(int i = 1; i <= mid; ++ i) ask.pb(arr[i]);
    if(query(ask)) r = mid;
    else l = mid + 1;
  }
 
 
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Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:25:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid = l + r >> 1;
             ~~^~~
eastereggs.cpp:23:20: warning: unused variable 'res' [-Wunused-variable]
  int l = 1, r = n, res;
                    ^~~

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