Submission #238665

#	Time	Username	Problem	Language	Result	Execution time	Memory
238665		crossing0ver	Sorting (IOI15_sorting)	C++17	0 / 100	30 ms	8880 KiB

sorting

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

using namespace std;
int n,a[10000],b[10000];

int findSwapPairs(int N1, int S1[], int m, int X[], int Y[], int P[], int Q[]) {
	n = N1;
	for (int i = 0; i <n ;i++) {
		a[i] = S1[i];
	}
	for (int i = 0; i < m ;i++) {
		swap(a[X[i]],a[Y[i]]);	
	}
	for (int i = 0; i < n; i++) {
		b[a[i]] = i;
	}
	vector<pair<int,int> > ans;
	
	for (int i = 0; i < n; i++) {
		int j = i;
		while (j && a[j] < a[j-1]) {
			swap(a[j],a[j-1]);
			ans.push_back({a[j],a[j-1]});
			j--;
		}
	}
	for (int i = 0; i < n; i++) {
		b[S1[i]] = i;
	}
	if (ans.size() == 0) return 0;
//	for (int i = 0; i < n; i++) cout << S1[i] <<' ';
	for (int i = 0; i < m; i++) ans.push_back({0,0});
	for (int i = 0; i < m; i++) {
	//	swap(S1[X[i]],S1[Y[i]]);
	//	b[S1[X[i]]] = X[i];
	//	b[S1[Y[i]]] = Y[i];
		swap(S1 [ b[ans[i].first]], S1[ b[ans[i].second ] ]);
	//	cout << S1[0] <<' '<<S1[1] <<'\n';
		P[i] =  b[ans[i].first];
		Q[i] =  b[ans[i].second];
		if (ans[i].first >= n || ans[i].second >= n) {
			cout <<"no";
			exit(0);
		}
		swap(b[ans[i].first], b[ans[i].second]);
		bool flag = 1;
		for (int i = 0; i < n-1 ;i++) if (S1[i] > S1[i+1]) flag = 0;
		if (flag)  return i+1;
	}
	return m;
}            /*
main(){
	srand(time(NULL));
	int n,m;
	cin >> n ;
	int s1[n];
	for (int i = 0; i < n;i++)	s1[i] = i;
	random_shuffle(s1,s1+n);
	for (int i = 0; i < n; i++) cout << s1[i] <<' ';
	cout <<endl;
//	cin >> m;
 m = n*n;
 int p[m],q[m];
	int x[m],y[m];
	memset(x,0,sizeof x);
	memset(y,0,sizeof y);
//	for (int i = 0; i < m;i++)  cin >> x[i] >> y[i];
	int e = findSwapPairs(n,s1,m,x,y,p,q);   
	for (int i = 0; i < e; i++)
		cout <<	p[i] <<' '<<q[i]<<endl;
	for (int i = 0; i < n; i++) cout << s1[i] <<' ';
	
	
	
}                         */
/* 5 6 4 3 2 1 0  
 0 1 
 1 2 
 2 3 
 3 4 
 0 1 
 1 2 
 */

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:48:12: warning: declaration of 'i' shadows a previous local [-Wshadow]
   for (int i = 0; i < n-1 ;i++) if (S1[i] > S1[i+1]) flag = 0;
            ^
sorting.cpp:34:11: note: shadowed declaration is here
  for (int i = 0; i < m; i++) {
           ^

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