Submission #1241381

#TimeUsernameProblemLanguageResultExecution timeMemory
1241381dostsBeech Tree (IOI23_beechtree)C++20
5 / 100
95 ms34748 KiB
#include "beechtree.h" #include <bits/stdc++.h> //#define int long long #define pii pair<int,int> #define vi vector<int> #define ff first #define ss second #define sp << " " << #define all(x) x.begin(),x.end() using namespace std; const int LIM = 2e5+1; vector<pii> edges[LIM]; vi ans(LIM,0),C,P; int N; vi ctr(LIM,0); int dfs(int node) { for (auto it : edges[node]) dfs(it.ff); if (edges[node].empty()) ans[node] = 1; else { if (ans[edges[node][0].ff] == 0) { ans[node] = 0; } else { ans[node] = 1; ans[node]&=(ctr[edges[node][0].ss] == N-node-1); } } ctr[C[node]]++; return ans[node]; } std::vector<int> beechtree(int N_, int M, std::vector<int> P_, std::vector<int> C_) { N = N_; P = P_,C = C_; ans.assign(N_,0); for (int i = 0;i<N;i++) edges[i].clear(); vi v; for (auto it : C) v.push_back(it); sort(all(v)); v.erase(unique(all(v)),v.end()); for (auto& it : C) it = lower_bound(all(v),it)-v.begin(); for (int i = 1;i<N;i++) { edges[P[i]].push_back({i,C[i]}); } dfs(0); return ans; }
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