Submission #753903

#	Time	Username	Problem	Language	Result	Execution time	Memory
753903		Xiaoyang	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	21 ms	472 KiB

eastereggs

#include<bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 1ll<<60
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
#define endl "\n"
void inc(ll &a,ll b) {a=(a+b)%mod;}
void dec(ll &a,ll b) {a=(a-b+mod)%mod;}
int lowbit(ll x) {return x&(-x);}
ll p0w(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}
#include "grader.h"
 
vector<int>edge[513],id;
void dfs(int u, int fa){
	id.pb(u);
	for(auto x:edge[u]){
		if(x==fa)continue;
		dfs(x,u);
	}
}
 
int findEgg (int N, vector < pair < int, int > > bridges){
    rep(i,0,N+1)edge[i].clear();
  	id.clear();
    for(auto x:bridges){
      edge[x.fi].pb(x.se);
      edge[x.se].pb(x.fi);
    }
    dfs(1,-1);
    ll lo=0,hi=N-1;
    while(lo<hi){
		ll mid=lo+hi+1>>1;
		vector<int>left;
		rep(i,lo,mid)left.pb(id[i]);
		if (query(vector<int>(id.begin(), id.begin() + mid)))hi=mid-1;
		else lo=mid;
	}
	return id[lo];
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:44:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   44 |   ll mid=lo+hi+1>>1;
      |          ~~~~~^~

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