Submission #1265417

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265417		BlockOG	Dreaming (IOI13_dreaming)	C++20	Compilation error	0 ms	0 KiB

dreaming

#include <bits/stdc++.h>

// mrrrow meeow :3
// go play vivid/stasis now! it's free on steam

#define fo(i, a, b) for (auto i = (a); i < (b); i++)
#define of(i, a, b) for (auto i = (b); i-- > (a);)
#define f first
#define s second
#define pb push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound
#define be(a) a.begin(), a.end()
using namespace std;

int ____init = [] {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    return 0;
}();

struct Component {
    int diameter;
    int longest;

    Component(int diameter, int longest) : diameter(diameter), longest(longest) {}
};

int vis[100000];
vector<pair<int, int>> adj[100000];

pair<int, int> dfs1(int i) {
    pair<int, int> res;

    queue<pair<int, int>> q;
    q.push({i, 0});
    while (q.size()) {
        auto [i, d] = q.front();
        q.pop();
        res = max(res, {d, i});

        vis[i] = 1;
        for (auto [j, t] : adj[i]) {
            if (vis[j] == 1) continue;
            q.push({j, d + t});
        }
    }

    return res;
}

pair<int, int> par[100000];

Component dfs2(int i) {
    int diameter = 0;
    vector<int> diameter_ends = {i};

    par[i] = {i, 0};
    queue<pair<int, int>> q;
    q.push({i, 0});
    while (q.size()) {
        auto [i, d] = q.front();
        q.pop();
        if (d > diameter) {
            diameter = d;
            diameter_ends = {i};
        } else if (d == diameter) diameter_ends.pb(i);

        vis[i] = 2;
        for (auto [j, t] : adj[i]) {
            if (vis[j] == 2) continue;
            par[j] = {i, t};
            q.push({j, d + t});
        }
    }

    int longest = 2000000000;
    for (int i : diameter_ends) {
        int d = 0;
        for (; i != par[i].f; d += par[i].s, i = par[i].f) longest = min(longest, max(d, diameter - d));
        longest = min(longest, max(d, diameter - d));
    }

    return Component(diameter, longest);
}

int travelTime(int n, int m, int l, int a[], int b[], int t[]) {
    fo(i, 0, m) {
        adj[a[i]].pb({b[i], t[i]});
        adj[b[i]].pb({a[i], t[i]});
    }

    vector<Component> comps;
    fo(i, 0, n) if (!vis[i]) {
        comps.pb(dfs2(dfs1(i).s));
    }

    sort(be(comps), [](Component &a, Component &b) { return a.longest < b.longest; });

    Component res = comps.back();
    comps.pop_back();

    for (Component i : comps) {
        res.diameter = max(max(res.diameter, i.diameter), res.longest + l + i.longest);
        res.longest = max(res.longest, i.longest + l);
    }

    return res.diameter;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccbw13hn.o: in function `main':
grader.c:(.text.startup+0xc4): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status