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Submission #842963

# Submission time Handle Problem Language Result Execution time Memory
842963 2023-09-03T13:57:03 Z pit4h Longest Trip (IOI23_longesttrip) C++17
5 / 100
 8 ms 612 KB 
#include<bits/stdc++.h>
#include "longesttrip.h"

using namespace std;

vector<int> longest_trip(int N, int D)
{
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    vector<int> path[2];  

    path[0] = {0}; 

    for (int i = 1; i < N; i++) {
        bool which = uniform_int_distribution<int>(0, 1)(rng);
        if (path[which].empty()) {
            which = !which;
        }

        if (are_connected({path[which].back()}, {i})) {
            path[which].push_back(i);
            if (!path[!which].empty() && 
                are_connected({path[!which].back()}, {i})) {
                while (!path[!which].empty()) {
                    path[which].push_back(path[!which].back());
                    path[!which].pop_back();
                }        
            }
        }
        else {
            path[!which].push_back(i);
        }
    }

    if (path[0].empty()) {
        return path[1];
    }
    if (path[1].empty()) {
        return path[0];
    }

    vector<int> res;
    if (are_connected({path[0][0], path[0].back()}, {path[1][0], path[1].back()})) {
        if (are_connected({path[0][0]}, {path[1][0]})) {
            for (int i: path[1]) {
                res.push_back(i);
            }
            reverse(res.begin(), res.end());
            for (int i: path[0]) {
                res.push_back(i);
            }
        }
        else if(are_connected({path[0][0]}, {path[1].back()})) {
            for (int i: path[1]) {
                res.push_back(i);
            }
            for (int i: path[0]) {
                res.push_back(i);
            }
        }
        else if(are_connected({path[0].back()}, {path[1][0]})) {
            for (int i: path[0]) {
                res.push_back(i);
            }
            for (int i: path[1]) {
                res.push_back(i);
            }
        }
        else {
            res = (path[0].size() > path[1].size())?path[0] : path[1];
        }
    }
    else {
        res = (path[0].size() > path[1].size())?path[0] : path[1];
    }

    return res;
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 2 ms 344 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 4 ms 612 KB Output is correct

Subtask #2
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 6 ms 344 KB Output is correct
5 Correct 5 ms 600 KB Output is correct
6 Incorrect 1 ms 344 KB invalid array
7 Halted 0 ms 0 KB -

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Incorrect 0 ms 344 KB invalid array
7 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 340 KB Output is correct
2 Correct 7 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 4 ms 344 KB Output is correct
6 Incorrect 1 ms 344 KB invalid array
7 Halted 0 ms 0 KB -