Submission #916998

#	Time	Username	Problem	Language	Result	Execution time	Memory
916998		Jakub_Wozniak	Permutation (APIO22_perm)	C++17	100 / 100	2 ms	504 KiB

perm

#include <bits/stdc++.h>
using namespace std;

vector <pair<int,int>> V;

vector<int> construct_permutation(long long n)
{
    if(n == 2)return {0};
    if(n == 3)return {1,0};
    if(n == 4)return {0,1};

    long long MAX = 900 , MIN = 0;
    vector <int> v;
    vector <int> B;
    long long akt = 0;
    int r[200];

    while(n)
    {
        B.push_back(n%2);
        n/=2;
    }
    reverse(B.begin() , B.end());

    if(B[1] == 1)
    {
        v.push_back(2);
        v.push_back(1);
        akt = 2;
    }
    else
    {
        if(B[2] == 0)
        {
            v.push_back(100);
            v.push_back(2);
            v.push_back(1);
        }
        else
        {
            v.push_back(2);
            v.push_back(100);
            v.push_back(1);
        }

        akt = 3;
    }

    while(akt+1 < B.size())
    {
        v.push_back(MAX);
        MAX++;
        if(B[akt]*2+B[akt+1] == 2){v.push_back(MIN);MIN--;}
        v.push_back(MAX);
        MAX++;
        if(B[akt]*2+B[akt+1] == 1){v.push_back(MIN);MIN--;}
        if(B[akt]*2+B[akt+1] == 3){v.push_back(MIN+3);}
        akt += 2;
    }

    if(akt < B.size())
    {
        v.push_back(MAX);
        MAX++;
        if(B[akt])v.push_back(MIN);
    }

    


    for(int i = 0 ; i < v.size() ; i++)
    {
        V.push_back({v[i],-i});
    }
    sort(V.begin() , V.end());

    akt = 0;
    for(int i = 0 ; i < V.size() ;i++)
    {
        r[-V[i].second] = akt;
        akt++;
    }


    for(int i = 0 ; i < V.size() ; i++)
    {
        v[i] = r[i]; 
    }
    V.clear();
    return v;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:49:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     while(akt+1 < B.size())
      |           ~~~~~~^~~~~~~~~~
perm.cpp:61:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     if(akt < B.size())
      |        ~~~~^~~~~~~~~~
perm.cpp:71:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |     for(int i = 0 ; i < v.size() ; i++)
      |                     ~~^~~~~~~~~~
perm.cpp:78:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     for(int i = 0 ; i < V.size() ;i++)
      |                     ~~^~~~~~~~~~
perm.cpp:85:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |     for(int i = 0 ; i < V.size() ; i++)
      |                     ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 90 / 90