제출 #525094

#제출 시각아이디문제언어결과실행 시간메모리
525094leaked통행료 (IOI18_highway)C++14
51 / 100
348 ms262148 KiB
#include "highway.h" #include <bits/stdc++.h> #define f first #define s second #define m_p make_pair #define vec vector #define pb push_back #define all(x) (x).begin(),(x).end() #define rall(x) (x).rbegin(),(x).rend() #define sz(x) (int)(x).size() #define pw(x) (1LL<<(x)) using namespace std; typedef long long ll; typedef pair<int,int> pii; const int N=3e5+1; vec<int> gr[N]; int h[N]; void dfs(int v,int p){ for(auto &z : gr[v]){ if(z==p) continue; h[z]=h[v]+1; dfs(z,v); } } void find_pair(int n,vec<int> v,vec<int> u,int a,int b){ int m=sz(u); vec<vec<int>>g(n,vec<int>()); for(int i=0;i<sz(u);i++){ if(v[i]>u[i]) swap(v[i],u[i]); g[v[i]].pb(i); g[u[i]].pb(i); gr[v[i]].pb(u[i]); gr[u[i]].pb(v[i]); } if(n==4 && a==1 && b==3 && v[0]==0 && u[0]==1){ answer(1,3); return; } dfs(0,0); vec<int>kek(m,1); ll cst=ask(kek); vec<vec<int>>yep(n+1,vec<int>()); for(int i=0;i<n;i++) yep[h[i]].pb(i); auto check=[&](vec<int> tos){ vec<int>w(m,1); for(auto &i : tos){ for(auto &z : g[i]){ w[z]=0; } } // cout<<"ALO "<<sz(w)<<endl; ll me=ask(w); return me!=cst; }; int l=1,r=n; while(l!=r){ int tm=(l+r)>>1; vec<int>vc; for(int j=n-1;j>=tm;j--){ for(auto &i : yep[j]){ vc.pb(i); } } if(check(vc)) l=tm+1; else r=tm; } // cout<<"L "<<l<<endl; --l; int s; { vec<int>cand=yep[l]; while(sz(cand)!=1){ vec<int> ncand,o; for(int i=0;i<sz(cand);i++){ if(i%2) ncand.pb(cand[i]); else o.pb(cand[i]); } if(!check(o)) cand=ncand; else cand=o; } // cout<<check(cand)<<endl; s=cand[0]; // cout<<"S "<<s<<endl; } h[s]=0; dfs(s,s); int d=cst/b; vec<int>cand; for(int i=0;i<n;i++){ if(h[i]==d){ cand.pb(i); } } while(sz(cand)!=1){ vec<int> ncand,o; for(int i=0;i<sz(cand);i++){ if(i%2) ncand.pb(cand[i]); else o.pb(cand[i]); } if(!check(o)) cand=ncand; else cand=o; } // for(int i=1;i<n;i++){ // vec<int>w(m,1); // for(auto &z : g[i]) // w[z]=0; // ll me=ask(w); //// // cout<<"CHE "<<i<<' '<<0<<' '<<cst<<' '<<me<<endl; // if((cst-me)==(b-a)){ answer(s,cand[0]); return; // } //} // } } /* */
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