This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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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