Submission #1049361

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049361		Zicrus	Longest Trip (IOI23_longesttrip)	C++17	15 / 100	731 ms	1696 KiB

longesttrip

#include <bits/stdc++.h>
#include "longesttrip.h"
using namespace std;
 
typedef long long ll;
 
vector<vector<ll>> adj, noAdj;
vector<bool> vst;
vector<vector<ll>> k;

void dfs(ll cur, ll comp) {
    vst[cur] = true;
    k[comp].push_back(cur);
    for (auto &e : noAdj[cur]) {
        if (vst[e]) continue;
        dfs(e, !comp);
    }
}
 
vector<int> longest_trip(int n, int d) {
    adj = vector<vector<ll>>(n);
    noAdj = vector<vector<ll>>(n);
    k = vector<vector<ll>>(2);
    for (int i = 0; i < n; i++) {
        for (int j = i+1; j < n; j++) {
            if (are_connected({i}, {j})) {
                adj[i].push_back(j);
                adj[j].push_back(i);
            }
            else {
                noAdj[i].push_back(j);
                noAdj[j].push_back(i);
            }
        }
    }

    vst = vector<bool>(n);
    ll comp = 0;
    for (int i = 0; i < n; i++) {
        if (vst[i]) continue;
        dfs(i, 0);
        comp = !comp;
    }
    if (k[0].size() < k[1].size()) swap(k[0], k[1]);

    ll mxDeg = 0, bridge = 0;
    for (auto &e : k[0]) {
        if (adj[e].size() > mxDeg) {
            mxDeg = adj[e].size();
            bridge = e;
        }
    }

    vst = vector<bool>(n);
    vector<int> res;
    for (auto &e : k[0]) {
        vst[e] = true;
        if (e == bridge) continue;
        res.push_back(e);
    }
    res.push_back(bridge);
    ll used = -1;
    for (auto &e : adj[bridge]) {
        if (vst[e]) continue;
        res.push_back(used = e);
        break;
    }
    if (used == -1) return res;
    for (auto &e : k[1]) {
        if (e == used) continue;
        res.push_back(e);
    }

    return res;
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:48:27: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   48 |         if (adj[e].size() > mxDeg) {
      |             ~~~~~~~~~~~~~~^~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60