#include <bits/stdc++.h>
#include "sorting.h"
#define vc vector
using namespace std;
int findSwapPairs(int n, int s[], int m, int x[], int y[], int a[], int b[])
{
int is[n];for(int i=0;i<n;++i) is[s[i]]=i;
int l=0, r=m-1;
while(l<r){
int mid=(l+r)/2, j=0;
{
int p[n], ip[n], z[n], iz[n];
for(int i=0;i<n;++i) p[i]=i, z[i]=iz[i]=i;
for(int i=mid;i>=0;--i) swap(p[x[i]], p[y[i]]);
for(int i=0;i<n;++i) ip[p[i]]=i;
for(int i=mid;i>=0;--i){
while(j<n && j==s[p[iz[j]]]) ++j;
if(j<n) a[i]=iz[j], b[i]=ip[is[j]];
else a[i]=b[i]=0;
swap(ip[p[x[i]]], ip[p[y[i]]]);
swap(p[x[i]], p[y[i]]);
swap(iz[z[a[i]]], iz[z[b[i]]]);
swap(z[a[i]], z[b[i]]);
swap(iz[z[x[i]]], iz[z[y[i]]]);
swap(z[x[i]], z[y[i]]);
}
}
if(j==n) r=mid;
else l=mid+1;
}
{
int p[n], ip[n], z[n], iz[n];
for(int i=0;i<n;++i) p[i]=i, z[i]=iz[i]=i;
for(int i=l;i>=0;--i) swap(p[x[i]], p[y[i]]);
for(int i=0;i<n;++i) ip[p[i]]=i;
for(int i=l;i>=0;--i){
while(j<n && j==s[p[iz[j]]]) ++j;
if(j<n) a[i]=iz[j], b[i]=ip[is[j]];
else a[i]=b[i]=0;
swap(ip[p[x[i]]], ip[p[y[i]]]);
swap(p[x[i]], p[y[i]]);
swap(iz[z[a[i]]], iz[z[b[i]]]);
swap(z[a[i]], z[b[i]]);
swap(iz[z[x[i]]], iz[z[y[i]]]);
swap(z[x[i]], z[y[i]]);
}
}
return l;
}
Compilation message
sorting.cpp: In function 'int findSwapPairs(int, int*, int, int*, int*, int*, int*)':
sorting.cpp:43:19: error: 'j' was not declared in this scope
43 | while(j<n && j==s[p[iz[j]]]) ++j;
| ^
sorting.cpp:44:16: error: 'j' was not declared in this scope
44 | if(j<n) a[i]=iz[j], b[i]=ip[is[j]];
| ^
