﻿ C : Return only the unique rows from a given binary matrix

# C Exercises: Return only the unique rows from a given binary matrix

## C Array: Exercise-72 with Solution

Write a program in C to return only the unique rows from a given binary matrix.

Sample Solution:

C Code:

``````#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define R 4 // Number of rows
#define C 5 // Number of columns

// Struct definition for trie node
typedef struct Node {
bool chkEndOfCol;      // Indicates the end of a row
struct Node *child; // Child nodes (left and right)
} myNode;

// Function to create a new node for the trie
myNode* newNode() {
myNode* temp = (myNode *)malloc( sizeof( myNode ) );
temp->chkEndOfCol = 0;
temp->child = temp->child = NULL;
return temp;
}

// Function to insert a row into the trie
bool insert(myNode** root, int (*arr1)[C], int r, int c) {
// If root is NULL, create a new node
if (*root == NULL)
*root = newNode();

// If within columns, continue inserting
if (c < C)
return insert(&((*root)->child[arr1[r][c]]), arr1, r, c+1);
else {
// If end of column, mark it in the trie
if (!((*root)->chkEndOfCol))
return (*root)->chkEndOfCol = 1;
return 0;
}
}

// Function to print a row of the array
void printRow(int (*arr1)[C], int r) {
int i;
for (i = 0; i < C; ++i)
printf("%d ", arr1[r][i]);
printf("\n");
}

// Function to find and print unique rows of the array
void findUniqueRows(int (*arr1)[C]) {
myNode* root = NULL;
int i;
printf("The unique rows of the given array are :\n");
for (i = 0; i < R; ++i) {
// If row is inserted into trie (i.e., not a duplicate), print the row
if (insert(&root, arr1, i, 0))
printRow(arr1, i);
}
}

int main() {
int arr1[R][C] = {
{0, 1, 0, 0, 1},
{1, 0, 1, 1, 0},
{0, 1, 0, 0, 1},
{1, 0, 1, 0, 0}
};
int i, j;

// Print the original array
printf("The given array is :\n");
for (i = 0; i < R; i++) {
for (j = 0; j < C; j++) {
printf("%d  ", arr1[i][j]);
}
printf("\n");
}

// Find and print unique rows of the array
findUniqueRows(arr1);
return 0;
}
```
```

Sample Output:

```The given array is :
0  1  0  0  1
1  0  1  1  0
0  1  0  0  1
1  0  1  0  0
The unique rows of the given array are :
0 1 0 0 1
1 0 1 1 0
1 0 1 0 0
```

Flowchart: C Programming Code Editor:

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