五、阅读程序-3

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#include <iostream>
#include <cstring>
using namespace std;

int map[100][100];
int sum[100], weight[100];
int visit[100];

int n;

void dfs(int node) {
    visit[node] = 1;
    sum[node] = 1;
    int v, maxw = 0;
    for (v = 1; v <= n; v++) {
        if (!map[node][v] || visit[v])
            continue;
        dfs(v);
        sum[node] += sum[v];
        if (sum[v] > maxw)
            maxw = sum[v];
    }
    if (n - sum[node] > maxw)
        maxw = n - sum[node];
    weight[node] = maxw;
}

int main() {
    memset(map, 0, sizeof(map));
    memset(sum, 0, sizeof(sum));
    memset(weight, 0, sizeof(weight));
    memset(visit, 0, sizeof(visit));
    cin >> n;
    int i, x, y;
    for (i = 1; i < n; i++) {
        cin >> x >> y;
        map[x][y] = 1;
        map[y][x] = 1;
    }
    dfs(1);
    int ans = n, ansN = 0;
    for (i = 1; i <= n; i++)
        if (weight[i] < ans) {
            ans = weight[i];
            ansN = i;
        }
    cout << ansN << " " << ans << endl;
    return 0;
}