Submission #1063946

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063946		parsadox2	Longest Trip (IOI23_longesttrip)	C++17	70 / 100	78 ms	856 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> maximal()
{
    for(int i = 0 ; i < n ; i++)
        in_path[i] = false;
    vector <int> vec;
    vec.push_back(0);
    in_path[0] = true;
    while(vec.size() < n)
    {
        vector <int> A; A.push_back(vec.back());
        vector <int> B;
        for(int i = 0 ; i < n ; i++)  if(!in_path[i])
            B.push_back(i);
        if(!are_connected(A , B))
            break;
        int low = 0 , high = B.size();
        while(high - low > 1)
        {
            int mid = (low + high) >> 1;
            vector <int> tmp;
            for(int i = low ; i < mid ; i++)
                tmp.push_back(B[i]);
            if(are_connected(A , tmp))
                high = mid;
            else
                low = mid;
        }
        in_path[B[low]] = true;
        vec.push_back(B[low]);
    }
    reverse(vec.begin() , vec.end());
    while(vec.size() < n)
    {
        vector <int> A;  A.push_back(vec.back());
        vector <int> B;
        for(int i = 0 ; i < n ; i++)  if(!in_path[i])
            B.push_back(i);
        if(!are_connected(A , B))
            break;
        int low = 0 , high = B.size();
        while(high - low > 1)
        {
            int mid = (low + high) >> 1;
            vector <int> tmp;
            for(int i = low ; i < mid ; i++)
                tmp.push_back(B[i]);
            if(are_connected(A , tmp))
                high = mid;
            else
                low = mid;
        }
        in_path[B[low]] = true;
        vec.push_back(B[low]);
    }
    return vec;
}

vector<int> longest_trip(int nn, int dd)
{
    n = nn;
    d = dd;
    vector <int> vec = maximal();
    vector <int> comp;
    for(int i = 0 ; i < n ; i++)  if(!in_path[i])
        comp.push_back(i);
    if(comp.empty())
        return vec;
    if(!are_connected(vec , comp))
    {
        if(vec.size() > comp.size())
            return vec;
        else
            return comp;
    }
    int low = 0 , high = vec.size();
    while(high - low > 1)
    {
        int mid = (low + high) >> 1;
        vector <int> tmp;
        for(int i = low ; i < mid ; i++)
            tmp.push_back(vec[i]);
        if(are_connected(tmp , comp))
            high = mid;
        else
            low = mid;
    }
    vector <int> res;
    for(int i = low + 1 ; i < vec.size() ; i++)
        res.push_back(vec[i]);
    for(int i = 0 ; i <= low ; i++)
        res.push_back(vec[i]);
    low = 0;  high = comp.size();
    vector <int> A;  A.push_back(res.back());
    while(high - low > 1)
    {
        int mid = (low + high) >> 1;
        vector <int> B;
        for(int i = low ; i < mid ; i++)
            B.push_back(comp[i]);
        if(are_connected(A , B))
            high = mid;
        else
            low = mid;
    }
    res.push_back(comp[low]);
    for(int i = 0 ; i < comp.size() ; i++)  if(i != low)
        res.push_back(comp[i]);
    return res;
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> maximal()':
longesttrip.cpp:17:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   17 |     while(vec.size() < n)
      |           ~~~~~~~~~~~^~~
longesttrip.cpp:41:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |     while(vec.size() < n)
      |           ~~~~~~~~~~~^~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:97:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   97 |     for(int i = low + 1 ; i < vec.size() ; i++)
      |                           ~~^~~~~~~~~~~~
longesttrip.cpp:115:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |     for(int i = 0 ; i < comp.size() ; i++)  if(i != low)
      |                     ~~^~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 30 / 60