Submission #988607

#	Time	Username	Problem	Language	Result	Execution time	Memory
988607		Gray	Longest Trip (IOI23_longesttrip)	C++17	5 / 100	755 ms	2348 KiB

longesttrip

#include "longesttrip.h"
#include<bits/stdc++.h>
#include <cassert>
using namespace std;
#define ll long long
#define ff first
#define ss second
#define ln endl
vector<vector<ll>> A;
ll n, d;
void dfs(ll u, vector<bool> &vis, vector<int> &trip){
    trip.push_back(u);
    vis[u]=1;
    for (auto v:A[u]){
        if (!vis[v]){
            dfs(v, vis, trip);
        }
    }
}
std::vector<int> longest_trip(int N, int D)
{
    n=N; d=D;
    A.clear();
    A.resize(N);
    for (ll i=0; i<n; i++){
        for (ll j=i+1; j<n; j++){
            if (are_connected({(int)i}, {(int)j})){
                A[i].push_back(j);
                A[j].push_back(i);
            }
        }
    }
    vector<ll> semi;
    for (ll i=0; i<n; i++){
        if (A[i].size()<n-1){
            semi.push_back(i);
        }
    }
    // assert(semi.size()>=0 and semi.size()<=2);
    vector<int> ans;
    if (semi.size()==2){
        ans.push_back(semi[0]);
        for (ll i=0; i<n; i++){
            if (i!=semi[0] and i!=semi[1]){
                ans.push_back(i);
            }
        }
        ans.push_back(semi[1]);
    }else{
        vector<bool> vis(n);
        for (ll i=0; i<n; i++){
            if (vis[i]==0){
                vector<int> trip;
                dfs(i, vis, trip);
                if (ans.size()<trip.size()){
                    ans=trip;
                }
            }
        }
    }
    return ans;
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:35:24: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   35 |         if (A[i].size()<n-1){
      |             ~~~~~~~~~~~^~~~

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