C Exercises: Find the row with maximum number of 1s

C Array: Exercise-60 with Solution

Write a program in C to find the row with the maximum number of 1s.

Sample Solution:

C Code:

#include <stdio.h>
#define R 5
#define C 5

// Function to find the index of the first occurrence of 1 in an array
int getFirstOccur(int arr1[], int l, int h) {
    if (h >= l) {
        int mid = l + (h - l) / 2;

        // Checking conditions to find the first occurrence of 1
        if ((mid == 0 || arr1[mid - 1] == 0) && arr1[mid] == 1)
            return mid;
        else if (arr1[mid] == 0)
            return getFirstOccur(arr1, (mid + 1), h);
        else
            return getFirstOccur(arr1, l, (mid - 1));
    }
    return -1;
}

// Function to find the row with the maximum number of 1s
int findRowMaxOne(int arr2d[R][C]) {
    int max_row_index = 0, max = -1; 
    int i, index;

    // Loop through each row to find the row with maximum 1s
    for (i = 0; i < R; i++) {
        index = getFirstOccur(arr2d[i], 0, C - 1); // Get index of first occurrence of 1

        // Update max_row_index if a row with more 1s is found
        if (index != -1 && C - index > max) {
            max = C - index;
            max_row_index = i;
        }
    }
    return max_row_index;
}

int main() {
    int arr2d[R][C] = {
        {0, 1, 0, 1, 1},
        {1, 1, 1, 1, 1},
        {1, 0, 0, 1, 0},
        {0, 0, 0, 0, 0},
        {1, 0, 0, 0, 1}
    };
    int i, j;					
    //------------- print original 2D array ------------------	
    printf("The given 2D array is :  \n");
    for(i = 0; i < R; i++) {
        for(j = 0; j < C; j++) {
            printf("%d  ", arr2d[i][j]);
        }
        printf("\n");
    } 
    //------------------------------------------------------ 					
    printf("The index of row with maximum 1s is:  %d ", findRowMaxOne(arr2d));
    return 0;
}

Sample Output:

The given 2D array is :  
0  1  0  1  1  
1  1  1  1  1  
1  0  0  1  0  
0  0  0  0  0  
1  0  0  0  1  
The index of row with maximum 1s is:  1

Flowchart:

C Programming Code Editor:

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