Submission #1163777

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1163777	2025-03-08 12:57:25	ChottuF	Railway (BOI17_railway)	C++20	0 / 100	117 ms	45316 KiB

railway

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#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5+5;
const int MAXH = 22;
vector<vector<int>> adj;
int up[MAXH][MAXN], depth[MAXN];
int tin[MAXN], tout[MAXN], timer = 0;
// DFS to compute depth, parent pointers, and tin/tout times.
void dfs(int x, int p, int d) {
    depth[x] = d;
    up[0][x] = p;
    tin[x] = ++timer;
    for(auto u : adj[x]) {
        if(u == p) continue;
        dfs(u, x, d+1);
    }
    tout[x] = timer;
}
int jmp(int x, int k) {
    for (int i = 0; i < MAXH; i++) {
        if(k & (1 << i))
            x = up[i][x];
    }
    return x;
}
 
 
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