Mine

#include<iostream>int main(){	bool check;	int a [ 5 ] ;	cout << " nhap du`m 5 con so di cha,  " ;	for ( int i = 0; i < 5; i ++ )	{		cout << " so thu  "<< i + 1  << " is:  " ;		cin >> a[i] ;	}	for ( int k = 0 ; k < 5; k++ )	{		check = false;		for ( int j = k+1 ; j < 5; j++ )		{			if ( a[j] == a[k])			{			check = true;			break;			}		}		if ( check == false )			cout <<  a[k] << "_";	}	cin >> check;}