Unique rows in boolean matrix

PROBLEM :

Given a binary matrix your task is to complete the function printMat which prints all unique rows of the given matrix. The function takes three arguments the first argument is a matrix M and the next two arguments are row and col denoting the rows and columns of the matrix.

Input:
The first line of input is an integer T denoting the no of test cases.Then T test cases follow. Each test case consists of 2 lines . The first line of each test case is are two integers row and col denoting the no of rows and columns of matrix . Then in the next line are row*col space separated values of the matrix M.

Output:
The output will be the unique rows of the matrix separated by space .

Note : Dont print new line after each row instead print "$" without quotes .

Constraints:
1<=T<=20
1<=row,col<=40
0<=M[ ][ ]<=1

Example:
Input
1
3 4
1 1 0 1 1 0 0 1 1 1 0 1

Output
1 1 0 1 $1 0 0 1 $

Explanation
Above the matrix of size 3x4 looks like
1 1 0 1
1 0 0 1
1 1 0 1
The two unique rows are 1 1 0 1 and 1 0 0 1 .

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

/*You are required to complete this function*/

int binary_to_decimal(int [MAX][MAX],int ,int ) ;
void printMat(int M[MAX][MAX],int row,int col)
{
    int arr[row] ;
    int k,i,j ;
    k=0 ;
   
    for(i=0;i<row;i++)
        arr[k++]=binary_to_decimal(M,i,col) ;
 
    for(i=k-1;i>=0;i--)
    {
        for(j=i-1;j>=0;j--)
        {
            if(arr[i]==arr[j])
            {
                arr[i]=-1 ;
                break ;
            }
        }
    }
   
    bool state=false ;
    for(i=0;i<row;i++)
    {
        if(arr[i]!=-1)
        for(j=0;j<col;j++)
        {
            cout<<M[i][j]<<" " ;
            state=true ;
        }
        else
            state=false ;
           
        if(state)
            cout<<"$" ;
    }
       
}

int binary_to_decimal(int M[MAX][MAX],int r,int col)
{
    int i,no ;
    no=0 ;
   
    for(i=0;i<col;i++)
        no=2*no+M[r][i] ;
       
    return no ;
}

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