Submission #1226498

#TimeUsernameProblemLanguageResultExecution timeMemory
1226498kokoxuyaEaster Eggs (info1cup17_eastereggs)C++20
0 / 100
0 ms484 KiB
#include "grader.h" #include <bits/stdc++.h> using namespace std; int curr; #define pb push_back void dfs(int cn, vector<int>&preorder, vector<vector<int>>&adjlist) { preorder[cn]=++curr; for(int to:adjlist[cn]) { if(preorder[to]!=0)continue; dfs(to,preorder,adjlist); } } int findEgg (int n, vector<pair<int,int>>bridges) { vector<int>preorder(n+1,0); vector<vector<int>>adjlist(n+1); for(int a=0;a<(n-1);a++) { int t1=bridges[a].first,t2=bridges[a].second; adjlist[t1].pb(t2); adjlist[t2].pb(t1); } curr=0; dfs(1,preorder,adjlist); int hi=n,lo=1,mid,ans; while(hi>=lo) { mid=(hi+lo)/2; vector<int>queset; for(int a=lo;a<=mid;a++){queset.pb(a);} if(query(queset)) { ans=mid; hi=mid-1; } else { lo=mid+1; } } return ans; }
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