Submission #133621

#	Time	Username	Problem	Language	Result	Execution time	Memory
133621		Mahdi_Jfri	Sorting (IOI15_sorting)	C++14	0 / 100	18 ms	380 KiB

sorting

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

using namespace std;

#define ll long long
#define pb push_back

const int maxn = 2e5 + 20;

int pos[maxn];

int findSwapPairs(int n, int a[], int m, int x[], int y[], int p[], int q[])
{
	bool f = 1;
	for(int i = 0; i < n; i++)
		if(a[i] != i)
			f = 0;

	if(f)
		return 0;

	swap(a[x[0]] , a[y[0]]);

	for(int i = 0; i < n; i++)
		pos[i] = i;
	for(int i = m - 2; i >= 0; i--)
		swap(pos[x[i + 1]] , pos[y[i + 1]]);

	for(int i = 0; i < m; i++)
	{
		bool f = 1;
		for(int j = 0; j < n; j++)
			if(a[j] != j)
				f = 0;

		if(f)
				return i + 1;
		for(int j = 0; j < n; j++)
			if(pos[j] != a[j])
			{
				int ind = -1;
				for(int k = 0; k < n; k++)
					if(a[k] == pos[j])
						ind = k;
				
				while(ind < 0);
				p[i] = j , q[i] = ind;
				swap(a[j] , a[ind]);
				break;
			}

		if(i + 1 < m)
		{
			swap(pos[x[i + 1]] , pos[y[i + 1]]);
			swap(a[x[i + 1]] , a[y[i + 1]]);
		}
	}

	return m;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:32:8: warning: declaration of 'f' shadows a previous local [-Wshadow]
   bool f = 1;
        ^
sorting.cpp:15:7: note: shadowed declaration is here
  bool f = 1;
       ^

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