Submission #69021

#	Time	Username	Problem	Language	Result	Execution time	Memory
69021		theknife2001	Sorting (IOI15_sorting)	C++17	20 / 100	5 ms	640 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>
//#include "grader.cpp"

using namespace std;
const int NN=555;
int b[NN];
int n;

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[])
{
    n=N;
    for(int i=0;i<n;i++)
        b[S[i]]=i;
    int ans=0;
    for(int j=0;j<M;j++)
    {
        swap(b[S[X[j]]],b[S[Y[j]]]);
        swap(S[X[j]],S[Y[j]]);
        for(int i=n-1;i>=0;i--)
        {
            if(S[i]!=i)
            {
                P[ans]=b[i];
                Q[ans]=i;
                swap(b[i],b[S[i]]);
                swap(S[i],S[b[S[i]]]);
                ans++;
                break ;
            }
        }
        for(int i=0;i<n;i++)
        {
            if(S[i]!=i)
                break;
            if(i==n-1)
                return ans;
        }
    }
    return ans;
}
/*
5
3 0 4 2 1
5
0 1
0 1
0 1
0 1
0 1
*/

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