Submission #1247782

#	Time	Username	Problem	Language	Result	Execution time	Memory
1247782		kl0989e	Sorting (IOI15_sorting)	C++20	16 / 100	1 ms	328 KiB

sorting

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

#define ll long long
#define pi pair<int, int>
#define pl pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(),(x).end()

bool check(int n, int s[], int r, int x[], int y[], int p[], int q[]) {
	for (int i=0; i<r; i++) {
		swap(s[x[i]],s[y[i]]);
		swap(s[p[i]],s[q[i]]);
	}
	bool ok=1;
	for (int i=0; i<n; i++) {
		ok&=(s[i]==i);
	}
	return ok;
}

int findSwapPairs(int n, int s[], int m, int x[], int y[], int p[], int q[]) {
	if (n==1) {
		return 0;
	}
	int ss[n];
	for (int i=0; i<n; i++) {
		ss[i]=s[i];
	}
	int ind=0;
	for (int i=0; i<n-1; i++) {
		swap(s[x[ind]],s[y[ind]]);
		p[ind]=i;
		q[ind]=find(s,s+n,i)-s;
		if (i==1) {
			p[ind]=0;
		}
		swap(s[p[ind]],s[q[ind]]);
		if (p[ind]!=q[ind] || i==0) {
			ind++;
		}
		else {
			swap(s[x[ind]],s[y[ind]]);
		}
	}
	if (s[0]!=0) {
		p[ind]=0;
		q[ind]=0;
		ind++;
	}
	assert(check(n,ss,ind,x,y,p,q));
	return ind;
}

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