Submission #727345

#	Time	Username	Problem	Language	Result	Execution time	Memory
727345		mdn2002	Ekoeko (COCI21_ekoeko)	C++14	110 / 110	238 ms	2732 KiB

Main

#include <bits/stdc++.h>
using namespace std;
long long n , is [200005] , ans , numm [31] , aa , bb;
vector < int > l [31] , r [31];
string s , a , b;
int main()
{
    cin >> n >> s;
    for ( int i = 0 ; i < 2 * n ; i ++ )
    {
        int c = s [i] - 'a';
        numm [c] ++;
    }
    for ( int i = 0 ; i < 2 * n ; i ++ )
    {
        int c = s [i] - 'a';
        if ( l [c] . size () != numm [c] / 2 ) l [c] . push_back ( i );
        else
        {
            r [c] . push_back ( i );
            is [i] = 1;
        }
    }
    int num = 0;
    for ( int i = n - 1 ; i >= 0 ; i -- )
    {
        if ( is [i] == 0 )
        {
            num ++;
            a . push_back ( s [i] );
        }
        else
        {
            ans += num;
            bb ++;
            b . push_back ( s [i] );
        }

    }
    reverse ( a . begin () , a . end () );
    reverse ( b . begin () , b . end () );
    num = 0;
    for ( int i = n ; i < 2 * n ; i ++ )
    {
        if ( is [i] == 1 )
        {
            num ++;
            b . push_back ( s [i] );
        }
        else
        {
            ans += num;
            aa ++;
            a . push_back ( s [i] );
        }
    }
    ans += aa * bb;
    for ( int i = 0 ; i < n ; i ++ )
    {
        for ( int j = i ; j < n ; j ++ )
        {
            if ( a [i] == b [j] )
            {
                for ( int k = j ; k > i ; k -- )
                {
                    ans ++;
                    swap ( b [k] , b [ k - 1 ] );
                }
                break;
            }
        }
    }
    cout << ans;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:17:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   17 |         if ( l [c] . size () != numm [c] / 2 ) l [c] . push_back ( i );
      |              ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 40 / 40