oj.uz

Submission #849335

# Submission time Handle Problem Language Result Execution time Memory
849335 2023-09-14T13:45:19 Z boris_mihov Longest Trip (IOI23_longesttrip) C++17
0 / 100
 1 ms 344 KB 
#include "longesttrip.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <random>
#include <vector>

typedef long long llong;
const int MAXN = 256 + 10;
const llong INF = 1e18;
const int INTINF = 1e9;

int n;
std::mt19937 rng(420);
std::vector <int> longest_trip(int N, int D)
{
    n = N;
    std::vector <int> a, b;
    a.push_back(0);
    for (int i = 1 ; i < n ; ++i)
    {
        if (b.size() || (rng() & 1))
        {
            bool resA = are_connected({a.back()}, {i});
            if (resA)
            {
                a.push_back(i);
            } else
            {
                if (b.empty())
                {
                    b.push_back(i);
                } else
                {
                    bool resB = are_connected({b.back()}, {i});
                    if (resB)
                    {
                        b.push_back(i);
                    } else
                    {
                        while (!b.empty())
                        {
                            a.push_back(b.back());
                            b.pop_back();
                        }

                        b.push_back(i);
                    }
                }
            }
        } else
        {
            bool resB = are_connected({b.back()}, {i});
            if (resB)
            {
                b.push_back(i);
            } else
            {
                bool resA = are_connected({a.back()}, {i});
                if (resA)
                {
                    a.push_back(i);
                } else
                {
                    while (!a.empty())
                    {
                        b.push_back(a.back());
                        a.pop_back();
                    }

                    b.push_back(i);
                    a = b;
                    b.clear();
                }
            }
        }
    }


    if (a.size() < b.size())
    {
        std::swap(a, b);
    }

    if (b.empty())
    {
        return a;
    }

    if (!are_connected(a, b))
    {
        return a;
    }

    if (are_connected({a[0]}, {b[0]}))
    {
        std::reverse(a.begin(), a.end());
        for (int i = 0 ; i < b.size() ; ++i)
        {
            a.push_back(b[i]);
        }

        return a;
    }

    if (b.size() > 1 && are_connected({a[0]}, {b.back()}))
    {
        std::reverse(b.begin(), b.end());
        std::reverse(a.begin(), a.end());
        for (int i = 0 ; i < b.size() ; ++i)
        {
            a.push_back(b[i]);
        }

        return a;
    }

    if (are_connected({b[0]}, {a.back()}))
    {
        for (int i = 0 ; i < b.size() ; ++i)
        {
            a.push_back(b[i]);
        }

        return a;
    }

    int aPos, bPos;
    int l = -1, r = a.size() - 1, mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        std::vector <int> prefix(a.begin(), a.begin() + mid + 1);
        if (!are_connected(prefix, b)) l = mid;
        else r = mid; 
    }

    aPos = r;
    std::vector <int> prefixA(a.begin(), a.begin() + aPos + 1);
    l = -1; r = b.size() - 1;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        std::vector <int> prefixB(b.begin(), b.begin() + mid + 1);
        if (!are_connected(prefixA, prefixB)) l = mid;
        else r = mid;
    }

    bPos = r;
    for (int i = 0 ; i < aPos ; ++i)
    {
        a.push_back(a[0]);
        a.erase(a.begin());
    }

    for (int i = 0 ; i < bPos ; ++i)
    {
        b.push_back(b[0]);
        b.erase(b.begin());
    }

    std::reverse(a.begin(), a.end());
    for (int i = 0 ; i < b.size() ; ++i)
    {
        a.push_back(b[i]);
    }

    return a;
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:99:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |         for (int i = 0 ; i < b.size() ; ++i)
      |                          ~~^~~~~~~~~~
longesttrip.cpp:111:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  111 |         for (int i = 0 ; i < b.size() ; ++i)
      |                          ~~^~~~~~~~~~
longesttrip.cpp:121:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |         for (int i = 0 ; i < b.size() ; ++i)
      |                          ~~^~~~~~~~~~
longesttrip.cpp:164:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  164 |     for (int i = 0 ; i < b.size() ; ++i)
      |                      ~~^~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 344 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #1
0.0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 344 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 344 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 344 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 344 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -