제출 #1072878

#제출 시각아이디문제언어결과실행 시간메모리
107287812345678즐거운 행로 (APIO20_fun)C++17
21 / 100
403 ms97564 KiB
#include "fun.h" #include <bits/stdc++.h> using namespace std; const int nx=1e5+5; int rt, pa[nx], lvl[nx]; vector<int> d[nx], res; set<pair<int, int>> s[nx]; pair<int, int> mx; pair<int, int> getmax(int x) { if (s[x].empty()) return {-1, -1}; return *(prev(s[x].end())); } void findmax(int x) { auto tmp=getmax(x); tmp.first-=lvl[x]; mx=max(mx, tmp); int u=x; while (u!=0) { int t=pa[u]; for (auto v:d[t]) { if (v==u) continue; pair<int, int> tmp=getmax(v); tmp.first-=lvl[v]; tmp.first+=lvl[x]-lvl[t]+1; mx=max(mx, tmp); } u=t; if (s[u].find({lvl[u], u})!=s[u].end()) mx=max(mx, {lvl[x]-lvl[u], u}); } } void addnode(int x) { int u=x; s[u].insert({lvl[u], u}); while (u!=0) u=pa[u], s[u].insert({lvl[x], x}); } void erasenode(int x) { int u=x; s[u].erase({lvl[u], u}); while (u!=0) u=pa[u], s[u].erase({lvl[x], x}); } std::vector<int> createFunTour(int N, int Q) { for (int i=1; i<N; i++) d[(i-1)/2].push_back(i), pa[i]=(i-1)/2, lvl[i]=lvl[pa[i]]+1; for (int i=0; i<N; i++) addnode(i); rt=N-1; res.push_back(rt); erasenode(rt); for (int i=1; i<N; i++) { //cout<<"rt "<<rt<<'\n'; mx={-1, -1}; findmax(rt); //cout<<mx.first<<' '<<mx.second<<'\n'; res.push_back(mx.second); erasenode(mx.second); rt=mx.second; } /* cout<<"res : "; for (auto x:res) cout<<x<<' '; cout<<'\n'; */ return res; }
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