Submission #132641

#	Time	Username	Problem	Language	Result	Execution time	Memory
132641		antimirage	Sorting (IOI15_sorting)	C++14	74 / 100	49 ms	18040 KiB

sorting

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

#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(), s.end()

using namespace std;

const int N = 2005;

int sz, cnt, res, u[N], a[N], pos[N], asd[N];

void dfs (int v) {
	cnt++;
	u[v] = 1;
	if (u[ a[v] ] == 0)
		dfs(a[v]);
}

int findSwapPairs(int n, int b[], int m, int x[], int y[], int p[], int q[]) {
    bool fl = 1;
    for (int i = 0; i < n; i++) {
		a[i] = b[i];
		if (a[i] != i)
			fl = 0;
	}
	if (fl)
		return 0;
	
	for (int i = 0; i < m; i++) {
		swap( a[ x[i] ], a[ y[i] ] );
		res = 0;
		memset(u, 0, sizeof(u));
		for (int j = 0; j < n; j++) {
			if (u[j]) continue;
			cnt = 0; dfs(j);
			res += cnt - 1;
		}
		if (res <= i + 1) {
			for (int j = 0; j < n; j++)
				pos[b[j]] = j, asd[a[j]] = j;
			
			int k = 0;
			
			for (int j = 0; j < n; j++) {
				if (a[j] == j) continue;
				pos[ b[x[k]] ] = y[k];
				pos[ b[y[k]] ] = x[k];
				swap( b[x[k]], b[y[k]] );
				p[k] = pos[a[j]], q[k] = pos[j];
				swap( b[pos[ a[j] ]], b[pos[j]] );
				swap( pos[ a[j] ], pos[j] );
				swap(a[j], a[asd[j]]);
				asd[a[asd[j]]] = asd[j];
				k++;
			}
			while (k < i) {
				p[k] = 0, q[k] = 0;
				k++;
			}
			return i + 1;
		}
	}
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:67:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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