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 | #include <vector>
#include <iostream>
#include <algorithm>
 
using namespace std;
 
bool uc_cpr( unsigned char * s1, unsigned char * s2 ) {
  return (*s1)<(*s2);
}
 
 
int main()
{
	vector< unsigned char * > v;
 
	unsigned char ptr[10][10][10];
 
	for( int i = 0; i < 10; ++i )
		for( int j = 0; j < 10; ++j )
			for( int k = 0; k < 10; ++k )
				ptr[i][j][k] = i+(i*j+k)+(i+j*k);
 
	for( int i = 0; i < 10; ++i )
		for( int j = 0; j < 10; ++j )
			for( int k = 0; k < 10; ++k )
				v.push_back( &ptr[i][j][k] );
 
	cout << "pre order:" << endl;
	for( unsigned int i = 0; i < v.size(); ++i )
		cout << '0' + *v[i] << endl;
 
	sort( v.begin(), v.end(), uc_cpr );
 
	cout << "post order:" << endl;
	for( unsigned int i = 0; i < v.size(); ++i )
		cout << '0' + *v[i] << endl;
} | 
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