Submission #1228342

#TimeUsernameProblemLanguageResultExecution timeMemory
1228342NonozeStations (IOI20_stations)C++20
0 / 100
1 ms560 KiB
#include "stations.h" #include <bits/stdc++.h> #define fi first #define se second #define pb push_back #define cmin(a, b) a=min(a, b) #define cmax(a, b) a=max(a, b) #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() #define sz(x) (int)x.size() using namespace std; vector<int> a; vector<bool> ismin; vector<vector<int>> adj; int cnt=1; pair<int, int> dfs(int u, int p=-1, bool mini=1) { if (sz(adj[u])==1 && p!=-1) { a[u]=10000*(cnt++); ismin[u]=mini; return {a[u], a[u]}; } a[u]=0; if (mini) a[u]=INT_MAX; pair<int, int> bests={INT_MAX, 0}; for (auto &v: adj[u]) if (v!=p) { auto [mn, mx]=dfs(v, u, mini^1); cmin(bests.fi, mn), cmax(bests.se, mx); } if (mini) a[u]=bests.fi-1, bests.fi=a[u]; else a[u]=bests.se+1, bests.se=a[u]; ismin[u]=mini; return bests; } vector<int> label(int n, int k, vector<int> u, vector<int> v) { adj.clear(), adj.resize(n); for (int i=0; i<n-1; i++) adj[u[i]].pb(v[i]), adj[v[i]].pb(u[i]); cnt=1, a.clear(), a.resize(n, -1), ismin.clear(), ismin.resize(n, 0); dfs(0); vector<int> b=a; sort(all(b)); map<int, int> mp; for (int i=0; i<n; i++) mp[b[i]]=i; for (int i=0; i<n; i++) a[i]=mp[a[i]]*2+(1-ismin[i]); for (int i=0; i<n; i++) cout << a[i] << ' '; cout << endl; return a; } int find_next_station(int s, int t, vector<int> c) { if (sz(c)==1) return c[0]; // cout << s << ' ' << t << endl; bool tmax=t%2, smax=s%2; t/=2, s/=2; for (auto &u: c) u/=2; // cout << s << ' ' << t << ' ' << smax << ' ' << tmax << endl; if (!tmax && !smax) { // both min // cout << "OK" << endl; if (t<s) return *max_element(all(c))*2+1; int best=*max_element(all(c)); for (auto u: c) if (t<=u) { cmin(best, u); } return best*2+1; } else if (tmax && smax) { // both max if (t>s) return *min_element(all(c))*2; int best=*min_element(all(c)); for (auto u: c) if (t>=u) { cmax(best, u); } return best*2; } else if (tmax && !smax) { // t: max, s: min if (t>=*max_element(all(c)) || t<=s) return *max_element(all(c))*2+1; int best=*max_element(all(c)); for (auto u: c) if (t<=u) { cmin(best, u); } return best*2+1; } else { // t: min, s: max if (t<=*min_element(all(c)) || t>=s) return *min_element(all(c))*2; // int cnt=0; // for (auto u: c) { // if (u<=t) cnt++; // if (u==t) return u*2; // } // if (cnt==1) return *min_element(all(c))*2; int best=*min_element(all(c)); for (auto u: c) if (t>=u) { cmax(best, u); } return best*2; } }
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