# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
830637 | Shithila | Sorting (IOI15_sorting) | C++14 | 1 ms | 340 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "sorting.h"
#include <bits/stdc++.h>
using namespace std;
int findSwapPairs(int N, int s[], int M, int X[], int Y[], int P[], int Q[]) {
int pos[N];
int ind=0;
for(int i=0;i<N;i++) pos[s[i]]=i;
int k;
int x;
if(s[0]==0 && s[1]==1)
{
ind=0;
}
else if(s[0]==0)
{
k=s[0];
pos[s[0]]=1;
pos[s[1]]=0;
s[0]=s[1];
s[1]=k;
P[ind]=1;
Q[ind]=pos[1];
x=pos[1];
pos[1]=1;
pos[s[1]]=x;
s[x]=s[1];
s[1]=1;
ind++;
}
else if(s[1]==1)
{
k=s[0];
pos[s[0]]=1;
pos[s[1]]=0;
s[0]=s[1];
s[1]=k;
P[ind]=0;
Q[ind]=pos[0];
x=pos[0];
pos[0]=0;
pos[s[0]]=x;
s[x]=s[0];
s[0]=0;
ind++;
}
else
{
k=s[0];
pos[s[0]]=1;
pos[s[1]]=0;
s[0]=s[1];
s[1]=k;
P[ind]=0;
Q[ind]=pos[0];
x=pos[0];
pos[0]=0;
pos[s[0]]=x;
s[x]=s[0];
s[0]=0;
ind++;
k=s[0];
pos[s[0]]=1;
pos[s[1]]=0;
s[0]=s[1];
s[1]=k;
P[ind]=0;
Q[ind]=pos[1];
x=pos[1];
pos[1]=0;
pos[s[0]]=x;
s[x]=s[0];
s[0]=1;
ind++;
}
for(int i=2;i<N;i++)
{
//ind++;
if(i==s[i]) continue;
k=s[0];
pos[s[0]]=1;
pos[s[1]]=0;
s[0]=s[1];
s[1]=k;
P[ind]=i;
Q[ind]=pos[i];
x=pos[i];
pos[i]=i;
pos[s[i]]=x;
s[x]=s[i];
s[i]=i;
ind++;
}
if(s[0]!=0)
{
ind++;
P[ind]=0;
Q[ind]=1;
}
return ind;
}
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