Submission #712124

#	Time	Username	Problem	Language	Result	Execution time	Memory
712124		neki	Sorting (IOI15_sorting)	C++14	Compilation error	0 ms	0 KiB

sorting

#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 (stderr)

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]];
      |                ^