Submission #1226182

#	Time	Username	Problem	Language	Result	Execution time	Memory
1226182		abdelhakim	Sorting (IOI15_sorting)	C++20	0 / 100	7 ms	576 KiB

sorting

#include "sorting.h"
#include <bits/stdc++.h>
#define dbg(x) cerr << #x << ' ' <<x << endl;
#define ll long long
using namespace std;
vector<ll> ind;
vector<ll> dest;
vector<ll> recip;
vector<ll> s;
void swp(ll i, ll j)
{
	swap(s[i],s[j]);
	swap(ind[s[i]],ind[s[j]]);
	swap(dest[s[i]],dest[s[j]]);
	recip[dest[s[i]]]=s[i];
	recip[dest[s[j]]]=s[j];
}
int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) {
    P[0] = 0;
	Q[0] = 0;
	ind.resize(N);
	dest.resize(N);
	recip.resize(N);
	for (int i=0;i<N;i++)
	{
		s.push_back(S[i]);
	}
	for (int i=0;i<N;i++)
	{
		ind[s[i]]=i;
		ll cur=i;
		for (int j=0;j<M;j++)
		{
			if(cur==X[j])
			{
				cur=Y[j];
			}
			else if(cur==Y[j])
			{
				cur=X[j];
			}
		}
		dest[s[i]]=cur;
		recip[cur]=s[i];
	}
	
	ll cur=0;
	for (int i=0;i<M;i++)
	{
		P[i]=0;
		Q[i]=0;
	}
	for (int i=0;i<M;i++)
	{
		swap(s[X[i]],s[Y[i]]);
		swap(ind[X[i]],ind[Y[i]]);
		for (;cur<N;cur++)
		{
			if(dest[cur]!=cur)
			{
				P[i]=ind[cur];
				Q[i]=ind[recip[cur]];
				swp(P[i],Q[i]);
				cur++;
				break;
			}
		}
	}
}

Compilation message (stderr)

sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:69:1: warning: no return statement in function returning non-void [-Wreturn-type]
   69 | }
      | ^

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