제출 #1096470

#제출 시각아이디문제언어결과실행 시간메모리
1096470onlk97즐거운 행로 (APIO20_fun)C++14
47 / 100
100 ms20120 KiB
#include "fun.h" #include <vector> #include <bits/stdc++.h> using namespace std; vector <int> createFunTour(int N,int Q){ int sz[N]; for (int i=0; i<N; i++) sz[i]=attractionsBehind(0,i); int rt=0,mn=N; for (int i=1; i<N; i++){ if (2*sz[i]>N&&sz[i]<mn){ mn=sz[i]; rt=i; } } int dep[N]; for (int i=0; i<N; i++) dep[i]=hoursRequired(rt,i); if (N==2) return {0,1}; vector <int> neigh; for (int i=0; i<N; i++) if (dep[i]==1) neigh.push_back(i); int col[N]; for (int i=0; i<N; i++){ col[i]=2; for (int j=0; j<2; j++){ if (hoursRequired(neigh[j],i)+1==dep[i]){ col[i]=j; break; } } if (i==rt) col[i]=-1; } set <pair <int,int>,greater <pair <int,int> > > s[3]; for (int i=0; i<N; i++) if (col[i]!=-1) s[col[i]].insert({dep[i],i}); vector <int> op; if (s[2].empty()){ if (s[0].size()<s[1].size()) swap(s[0],s[1]); for (int i=0; i<N-1; i++){ if (i%2==0){ op.push_back((*s[0].begin()).second); s[0].erase(s[0].begin()); } else { op.push_back((*s[1].begin()).second); s[1].erase(s[1].begin()); } } } else { int prv=-1; while (s[0].size()!=s[1].size()+s[2].size()&&s[1].size()!=s[0].size()+s[2].size()&&s[2].size()!=s[0].size()+s[1].size()){ pair <int,int> best={-1,-1}; int ha=-1; for (int i=0; i<3; i++){ if (prv==i||s[i].empty()) continue; pair <int,int> tp=*s[i].begin(); if (tp>best){ best=tp; ha=i; } } op.push_back(best.second); prv=ha; s[ha].erase(best); } int w=2; if (s[0].size()==s[1].size()+s[2].size()) w=0; else if (s[1].size()==s[0].size()+s[2].size()) w=1; if (prv==-1){ int nxt=(w+1)%3; for (auto j:s[(nxt+1)%3]) s[nxt].insert(j); while (!s[w].empty()){ op.push_back((*s[w].begin()).second); s[w].erase(s[w].begin()); op.push_back((*s[nxt].begin()).second); s[nxt].erase(s[nxt].begin()); } } else { int rem=w^prv^3; if ((*s[rem].begin()).first>=(*s[w].begin()).first){ pair <int,int> tp=*s[rem].begin(); int f=1; while (!s[w].empty()){ if (f){ op.push_back(tp.second); for (auto j:s[rem]) s[prv].insert(j); s[prv].erase(tp); } else { op.push_back((*s[prv].begin()).second); s[prv].erase(s[prv].begin()); } op.push_back((*s[w].begin()).second); s[w].erase(s[w].begin()); f=0; } } else { for (auto j:s[rem]) s[prv].insert(j); while (!s[w].empty()){ op.push_back((*s[w].begin()).second); s[w].erase(s[w].begin()); op.push_back((*s[prv].begin()).second); s[prv].erase(s[prv].begin()); } } } } op.push_back(rt); return op; }
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