Submission #634645

#TimeUsernameProblemLanguageResultExecution timeMemory
634645inksamuraiPoklon (COCI17_poklon7)C++17
120 / 120
727 ms239972 KiB
#include <bits/stdc++.h> using namespace std; #define rep(i,n) for(int i=0;i<n;i++) #define rng(i,c,n) for(int i=c;i<n;i++) #define per(i,n) for(int i=n-1;i>=0;i--) #define fi first #define se second #define pb push_back #define sz(a) (int)a.size() #define vec(...) vector<__VA_ARGS__> #define _3PGDklf ios::sync_with_stdio(0),cin.tie(0) typedef long long ll; using pii=pair<int,int>; using vi=vector<int>; void print(){cout<<'\n';} template<class h,class...t> void print(const h&v,const t&...u){cout<<v<<' ',print(u...);} // e const int _n=1000001; int cntr[_n]; pii rbe[_n]; signed main(){ _3PGDklf; int n; cin>>n; vec(vi) adj(n); rep(i,n){ int ul,ur; cin>>ul>>ur; adj[i].pb(ul); adj[i].pb(ur); } string s; auto bintostr=[&](int v)->string{ if(v==0) return "0"; s=""; while(v>0){ s+=(char)((v%2)+'0'); v/=2; } reverse(s.begin(), s.end()); return s; }; auto compare=[&](pii l,pii r)->bool{ if(l.se!=r.se){ return l.se>r.se; } string sl=bintostr(l.fi); string sr=bintostr(r.fi); // while(sz(sl)<sz(sr)){ // sl.pb('0'); // } // while(sz(sr)<sz(sl)){ // sr.pb('0'); // } return sl>sr; }; auto dfs=[&](auto&&self,int v)->void{ int ma=-1; rep(i,sz(adj[v])){ int u=adj[v][i]; if(i==0){ if(u>0){ self(self,u-1); }else{ ma=max(ma,-u); } }else{ if(u>0){ self(self,u-1); }else{ ma=max(ma,-u); } } } cntr[v]=v; if(ma>=0){ rbe[v]={ma,sz(bintostr(ma))}; } int ul=cntr[adj[v][0]<=0?v:adj[v][0]-1]; int ur=cntr[adj[v][1]<=0?v:adj[v][1]-1]; cntr[v]=ul; if(compare(rbe[ur],rbe[ul])){ cntr[v]=ur; } rbe[cntr[v]].se+=1; }; dfs(dfs,0); pii p=rbe[cntr[0]]; string tmp=bintostr(p.fi); cout<<tmp; rep(_,p.se-sz(tmp)){ cout<<"0"; } }
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