Submission #620966

#	Time	Username	Problem	Language	Result	Execution time	Memory
620966		mdn2002	Sorting (IOI15_sorting)	C++14	54 / 100	36 ms	31676 KiB

sorting

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

int n , m , a [502] , x [20004] , y [20004] , dis [502][20004];

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {

    n = N;
    for ( int i = 1 ; i <= n ; i ++ )
    {
        a [i] = S [ i - 1 ];
        a [i] ++;
    }
    m = M;
    for ( int i = 0 ; i < m ; i ++ )
    {
        x [i] = X [i] , y [i] = Y [i];
        x [i] ++ , y [i] ++;
    }
    for ( int i = 1 ; i <= n ; i ++ ) dis [i][m] = i;
    for ( int j = m - 1 ; j >= 0 ; j -- )
    {
        for ( int i = 1 ; i <= n ; i ++ ) dis [i][j] = dis [i][ j + 1 ];
        swap ( dis [ x [j] ][j] , dis [ y [j] ][j] );
    }
    int r = 0;
    for ( int i = 1 ; i <= m ; i ++ )
    {
        int f = 0;
        for ( int i = 1 ; i <= n ; i ++ ) 
        {
            if ( a [i] != i ) f = 1;
        }
        if ( f == 0 ) return r;
        swap ( a [ x [ i - 1 ] ] , a [ y [ i - 1 ] ] );
        P [ i - 1 ] = -1 , Q [ i - 1 ] = -1;
        for ( int j = 1 ; j <= n ; j ++ )
        {
            if ( dis [j][i] != a [j] )
            {
                int wr;
                for ( int z = 1 ; z <= n ; z ++ )
                {
                    if ( a [z] == dis [j][i] )
                    {
                        wr = z;
                        break;
                    }
                }
                P [ i - 1 ] = j - 1 , Q [ i - 1 ] = wr - 1;
                swap ( a [j] , a [wr] );
                r ++;
                break;
            }
        }
        if ( P [ i - 1 ] == -1 )
        {
            P [ i - 1 ] = 0;
            Q [ i - 1 ] = 0;
            r ++;
        }
    }
    return r;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:31:19: warning: declaration of 'i' shadows a previous local [-Wshadow]
   31 |         for ( int i = 1 ; i <= n ; i ++ )
      |                   ^
sorting.cpp:28:15: note: shadowed declaration is here
   28 |     for ( int i = 1 ; i <= m ; i ++ )
      |               ^

• Subtask 1: 8 / 8
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 0 / 20
• Subtask 6: 0 / 26