Submission #927653

#	Time	Username	Problem	Language	Result	Execution time	Memory
927653		aykhn	Longest Trip (IOI23_longesttrip)	C++17	15 / 100	22 ms	1256 KiB

longesttrip

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

using namespace std;

vector<int> longest_trip(int n, int D)
{
    vector<int> used(n, 0);
    vector<int> v1, v2, cur;
    for (int i = 0; i < 3; i++)
    {
        for (int j = i + 1; j < 3; j++)
        {
            if (are_connected({i}, {j}))
            {
                v1.push_back(i), v1.push_back(j);
                used[i] = used[j] = 1;
                break;
            }
        }
        if (!v1.empty()) break;
    }
    for (int i = 0; i < n; i++)
    {
        if (used[i]) continue;
        if (!v1.empty() && !v2.empty() && are_connected(v1, {i}) && are_connected(v2, {i})) 
        {
            cur.clear();
            for (int x : v1) cur.push_back(x);
            cur.push_back(i);
            for (int x : v2) cur.push_back(x);
            v1 = cur;
        }
        else if (are_connected(v1, {i})) 
        {
            vector<int> nw;
            int idx = -1;
            for (int j = 0; j < v1.size(); j++) 
            {
                if (are_connected({i}, {v1[j]})) 
                {
                    idx = j;
                    break;
                }
            }
            nw.push_back(i), nw.push_back(v1[idx]);
            for (int j = (idx + 1) % v1.size(); j != idx; j = (j + 1) % v1.size())
            {
                nw.push_back(v1[j]);
            }
            v1 = nw;
        }
        else 
        {
            if (v2.empty()) v2.push_back(i);
            else
            {
                vector<int> nw;
                int idx = -1;
                for (int j = 0; j < v2.size(); j++) 
                {
                    if (are_connected({i}, {v2[j]})) 
                    {
                        idx = j;
                        break;
                    }
                }
                nw.push_back(i), nw.push_back(v2[idx]);
                for (int j = (idx + 1) % v2.size(); j != idx; j = (j + 1) % v2.size())
                {
                    nw.push_back(v2[j]);
                }
                v2 = nw;
            }
        }
        // cout << i << ":\n";
        // for (int x : v1) cout << x << ' ';
        // cout << '\n';
        // for (int x : v2) cout << x << ' ';
        // cout << '\n';
        // for (int x : cur) cout << x << ' ';
        // cout << '\n';
    }
    if (max({v1.size(), v2.size(), cur.size()}) == v1.size()) return v1;
    if (max({v1.size(), v2.size(), cur.size()}) == v2.size()) return v2;
    return cur;
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:38:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |             for (int j = 0; j < v1.size(); j++)
      |                             ~~^~~~~~~~~~~
longesttrip.cpp:60:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |                 for (int j = 0; j < v2.size(); j++)
      |                                 ~~^~~~~~~~~~~

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