Submission #422706

#	Time	Username	Problem	Language	Result	Execution time	Memory
422706		vanic	Sorting (IOI15_sorting)	C++14	0 / 100	1 ms	332 KiB

sorting

#include "sorting.h"
#include <algorithm>

using namespace std;

const int maxn=2e5+5;

int pos[maxn];

int findSwapPairs(int n, int l[], int m, int x[], int y[], int p[], int q[]){
	for(int i=0; i<n; i++){
		pos[l[i]]=i;
	}
	int br=2;
	int dr;
	for(int i=0; i<n-2; i++){
		swap(l[x[i]], l[y[i]]);
		swap(pos[l[x[i]]], pos[l[y[i]]]);
		p[i]=pos[br];
		q[i]=br;
		dr=l[br];
		swap(l[pos[dr]], l[pos[br]]);
		swap(pos[br], pos[dr]);
		br++;
	}
	int sol;
	if(l[0]==0){
		sol=n-2;
	}
	else{
		sol=n-1;
		swap(l[x[n-2]], l[y[n-2]]);
		swap(pos[l[x[n-2]]], pos[l[y[n-2]]]);
		p[n-2]=0;
		if(l[0]!=0){
			q[n-2]=1;
		}
		else{
			q[n-2]=0;
		}
	}
	return sol;
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:10:39: warning: unused parameter 'm' [-Wunused-parameter]
   10 | int findSwapPairs(int n, int l[], int m, int x[], int y[], int p[], int q[]){
      |                                   ~~~~^

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