제출 #879473

#제출 시각아이디문제언어결과실행 시간메모리
879473TAhmed33Papričice (COCI20_papricice)C++98
50 / 110
1084 ms16152 KiB
#include <bits/stdc++.h> using namespace std; const int MAXN = 2e5 + 25; vector <int> adj[MAXN]; int sze[MAXN], n, in[MAXN], out[MAXN], t; typedef long long ll; void dfs (int pos, int par) { sze[pos] = 1; in[pos] = ++t; for (auto j : adj[pos]) { if (j == par) continue; dfs(j, pos); sze[pos] += sze[j]; } out[pos] = t; } bool check (int x, int y) { return in[y] < in[x] && in[x] <= out[y]; } int main () { cin >> n; for (int i = 1; i < n; i++) { int a, b; cin >> a >> b; adj[a].push_back(b); adj[b].push_back(a); } dfs(1, -1); int mn = 1e9; for (int i = 2; i <= n; i++) { for (int j = i + 1; j <= n; j++) { if (check(i, j)) { int x = n - sze[j]; mn = min(mn, max({sze[i], sze[j] - sze[i], x}) - min({sze[i], sze[j] - sze[i], x})); } else if (check(j, i)) { int x = n - sze[i]; mn = min(mn, max({sze[i] - sze[j], sze[j], x}) - min({sze[i] - sze[j], sze[j], x})); } else { int x = n - sze[j] - sze[i]; mn = min(mn, max({sze[i], sze[j], x}) - min({sze[i], sze[j], x})); } } } cout << mn << '\n'; }
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