Submission #1064039

#	Time	Username	Problem	Language	Result	Execution time	Memory
1064039		parsadox2	Longest Trip (IOI23_longesttrip)	C++17	85 / 100	15 ms	680 KiB

longesttrip

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

using namespace std;

const int N = 256;
int n , d;
bool in_path[N];

vector<int> longest_trip(int nn, int dd)
{
    n = nn;
    d = dd;
    vector <int> p1;
    vector <int> p2;
    for(int i = 0 ; i < n ; i++)
    {
        if(p1.empty())
        {
            p1.push_back(i);
            continue;
        }
        else if(p2.empty())
        {
            p2.push_back(i);
            continue;
        }
        vector <int> A;  A.push_back(p1.back());
        vector <int> B;  B.push_back(i);
        if(are_connected(A , B))
        {
            p1.push_back(i);
            continue;
        }
        A.back() = p2.back();
        if(are_connected(A , B))
        {
            p2.push_back(i);
            continue;
        }
        reverse(p2.begin() , p2.end());
        for(auto u : p2)
            p1.push_back(u);
        p2 = B;
    }
    if(p2.empty())
        return p1;
    vector <int> A;  A.push_back(p1.back());
    vector <int> B;  B.push_back(p2.back());
    if(are_connected(A , B))
    {
        reverse(p2.begin() , p2.end());
        for(auto u : p2)
            p1.push_back(u);
        p2.clear();
    }
    if(p2.empty())
        return p1;
    A.back() = p1[0];
    if(are_connected(A , B))
    {
        reverse(p1.begin() , p1.end());
        reverse(p2.begin() , p2.end());
        for(auto u : p2)
            p1.push_back(u);
        p2.clear();
    }
    if(p2.empty())
        return p1;
    B.back() = p2[0];
    if(are_connected(A , B))
    {
        reverse(p1.begin() , p1.end());
        for(auto u : p2)
            p1.push_back(u);
        p2.clear();
    }
    if(p2.empty())
        return p1;
    A.back() = p1.back();
    if(are_connected(A , B))
    {
        for(auto u : p2)
            p1.push_back(u);
        p2.clear();
    }
    if(p2.empty())
        return p1;
    if(!are_connected(p1 , p2))
    {
        if(p1.size() > p2.size())
            return p1;
        return p2;
    }
    int low = 0 , high = p1.size();
    while(high - low > 1)
    {
        int mid = (low + high) >> 1;
        vector <int> tmp;
        for(int i = low ; i < mid ; i++)
            tmp.push_back(p1[i]);
        if(are_connected(tmp , p2))
            high = mid;
        else
            low = mid;
    }
    vector <int> res;
    for(int i = low + 1 ; i < p1.size() ; i++)
        res.push_back(p1[i]);
    for(int i = 0 ; i <= low ; i++)
        res.push_back(p1[i]);
    A.back() = res.back();
    low = 0;  high = p2.size();
    while(high - low > 1)
    {
        int mid = (low + high) >> 1;
        vector <int> tmp;
        for(int i = low ; i < mid ; i++)
            tmp.push_back(p2[i]);
        if(are_connected(A , tmp))
            high = mid;
        else
            low = mid;
    }
    for(int i = low ; i < p2.size() ; i++)
        res.push_back(p2[i]);
    for(int i = 0 ; i < low ; i++)
        res.push_back(p2[i]);
    return res;
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:108:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |     for(int i = low + 1 ; i < p1.size() ; i++)
      |                           ~~^~~~~~~~~~~
longesttrip.cpp:125:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  125 |     for(int i = low ; i < p2.size() ; i++)
      |                       ~~^~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 45 / 60