Submission #387199

#	Time	Username	Problem	Language	Result	Execution time	Memory
387199		alireza_kaviani	Sorting (IOI15_sorting)	C++11	20 / 100	7 ms	5248 KiB

sorting

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

#define SZ(x)			int(x.size())

const int MAXN = 2e5 + 10;

int cnt , to[MAXN] , pos[MAXN] , mark[MAXN];
vector<int> vec , adj[MAXN];

void DFS(int v){
	mark[v] = 1;
	vec.push_back(v);
	for(int u : adj[v]){
		if(!mark[u])	DFS(u);
	}
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    for(int i = 0 ; i < N ; i++)	to[i] = pos[i] = i;
	for(int i = 0 ; i < M ; i++){
		swap(S[X[i]] , S[Y[i]]);
	}
	for(int i = 0 ; i < N ; i++){
		adj[i].push_back(S[i]);
//		cout << S[i] << ' ';
	}
//	cout << endl;
	for(int i = 0 ; i < N ; i++){
		if(!mark[i]){
			vec.clear();
			DFS(i);
			for(int j = 1 ; j < SZ(vec) ; j++){
				P[cnt] = vec[0];
				Q[cnt] = vec[j];
				cnt++;
			}
		}
	}
	for(int i = M - 1 ; i >= 0 ; i--){
		if(i < cnt){
			P[i] = to[P[i]];
			Q[i] = to[Q[i]];
		}
		to[pos[X[i]]] = Y[i];
		to[pos[Y[i]]] = X[i];
		swap(pos[X[i]] , pos[Y[i]]);
	}
	return cnt;
}

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