Submission #335982

#	Time	Username	Problem	Language	Result	Execution time	Memory
335982		arujbansal	꿈 (IOI13_dreaming)	C++17	Compilation error	0 ms	0 KiB

dreaming

#include <bits/stdc++.h>
#include "dreaming.h"

#define rng_init mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
using namespace std;

const int MAXN = 1e5 + 5, INF = 1e9 + 5;
using ll = long long;

vector<pair<int, int>> g[MAXN];
vector<pair<int, int>> bestComps;
bool vis[MAXN];
pair<int, int> leaf[2];
pair<int, int> optimalRoot;
int diameterDist[MAXN][2];

void diameter(int u, int p, int dist, int idx) {
    vis[u] = true;

    leaf[idx] = max(leaf[idx], make_pair(dist, u));
    diameterDist[u][idx] = dist;

    optimalRoot = min(optimalRoot, make_pair(max(diameterDist[u][0], diameterDist[u][1]), u));

    for (const auto &[v, wt] : g[u]) {
        if (v == p) continue;
        dfs(v, u, dist + wt, idx);
    }
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    for (int i = 0; i < M; i++) {
        g[A[i]].emplace_back(B[i], T[i]);
        g[B[i]].emplace_back(A[i], T[i]);
    }

    for (int i = 0; i < N; i++) {
        if (vis[i]) continue;

        leaf[0] = leaf[1] = {-INF, -INF};

        diameter(u, -1, 0, 0);
        diameter(leaf[0].second, -1, 0, 1);
        optimalRoot = {INF, i};
        diameter(leaf[1].second, -1, 0, 0);

        bestComps.emplace_back(optimalRoot.first, optimalRoot.second);
    }

    sort(bestComps.begin(), bestComps.end(), greater<>());

    int best = bestComps.front().second;
    
    for (int i = 1; i < int(bestComps.size()); i++) {
        int v = bestComps[i].second;

        g[best].emplace_back(v, L);
        g[v].emplace_back(best, L);
    }

    leaf[0] = leaf[1] = {-INF, -INF};

    diameter(0, -1, 0, 0);
    diameter(leaf[0].second, -1, 0, 1);

    return leaf[1].first;
}

Compilation message (stderr)

dreaming.cpp: In function 'void diameter(int, int, int, int)':
dreaming.cpp:27:9: error: 'dfs' was not declared in this scope; did you mean 'ffs'?
   27 |         dfs(v, u, dist + wt, idx);
      |         ^~~
      |         ffs
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:42:18: error: 'u' was not declared in this scope
   42 |         diameter(u, -1, 0, 0);
      |                  ^