Submission #966365

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
966365	2024-04-19 18:19:08	eysbutno	Hard route (IZhO17_road)	C++17	100 / 100	769 ms	175940 KiB

road

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/**
 * Assume there is some hard route that goes from vertex
 * u to vertex v. Let the node that the path from u to v and the
 * furthest node from the hard route meet be node x. Use rerooting
 * DP to calculate the hardest route and the # of such hardest routes
 * for every node x.
 * 
 * Time Complexity: O(n log(n))
*/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
    int n; 
    cin >> n;
    vector<vector<int>> adj(n);
    for (int i = 1; i < n; i++) {
        int x, y; 
        cin >> x >> y;
        --x, --y;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    vector<int> max_length(n), path_count(n);
    function<void(int, int)> dfs = [&](int u, int p) {
    /**
         * Calculates the longest path from vertex u,
         * and the number of such paths.
 
 
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• Subtask 1: 19 / 19
• Subtask 2: 33 / 33
• Subtask 3: 48 / 48