Submission #847214

#	Time	Username	Problem	Language	Result	Execution time	Memory
847214		Trisanu_Das	Longest Trip (IOI23_longesttrip)	C++17	60 / 100	435 ms	1112 KiB

longesttrip

#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;
 
vector<int> longest_trip(int N, int D) {
    vector<int> ans = {0};
    vector<bool> vis(N, false);
    vis[0] = true;
    vector<vector<int> > adj(N, vector<int>(N, -1));
    auto is_connected = [&] (int x, int y) {
        if (adj[x][y] >= 0) return adj[x][y];
        adj[x][y] = adj[y][x] = are_connected({x}, {y});
        return adj[x][y];
    };
    while (true) {
        if (ans.size() == N) return ans;
        bool flag = false;
        for (int i = 0; i < N && !flag; i++) {
            if (!vis[i]) {
                if (is_connected(ans[0], i)) {
                    ans.insert(ans.begin(), i);
                    flag = vis[i] = true;
                    break;
                }
                if (is_connected(ans.back(), i)) {
                    ans.push_back(i);
                    flag = vis[i] = true;
                    break;
                }
                for (int j = 0; j < ans.size(); j++) {
                    if (is_connected(ans[j], i)) {
                        vector<int> new_path;
                        new_path.insert(new_path.end(), ans.begin() + j + 1, ans.end());
                        new_path.insert(new_path.end(), ans.begin(), ans.begin() + j + 1);
                        ans = new_path; 
                        ans.push_back(i);
                        flag = vis[i] = true;
                        break;
                    }
                }
            }
        }
        if (!flag) {
            if (ans.size() >= (N - ans.size()))  return ans;
            ans.clear();
            for (int i = 0; i < N; i++) if (!vis[i]) ans.push_back(i);
            return ans;
        }
    }
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:16:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |         if (ans.size() == N) return ans;
      |             ~~~~~~~~~~~^~~~
longesttrip.cpp:30:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |                 for (int j = 0; j < ans.size(); j++) {
      |                                 ~~^~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 19.999999998 / 60