C Programming Codes

#include <stdio.h>

int main() {
  int rows, cols, i, j;
  printf("Enter rows and columns: ");
  scanf("%d %d", &rows, &cols);
  int matrix[rows][cols];

  printf("Enter matrix elements:\n");
  for (i = 0; i < rows; i++) {
    for (j = 0; j < cols; j++) {
      scanf("%d", &matrix[i][j]);
    }
  }

  printf("Matrix elements are:\n");
  for (i = 0; i < rows; i++) {
    for (j = 0; j < cols; j++) {
      printf("%d ", matrix[i][j]);
    }
    printf("\n");
  }
  return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {1, 3, 2, 4, 5, 6, 3, 8, 9};
    int n = sizeof(arr) / sizeof(arr[0]);
    int maxLength = 1;
    int currentLength = 1;
    int start = 0;
    int bestStart = 0;

    for (int i = 1; i < n; i++) {
        if (arr[i] > arr[i - 1]) {
            currentLength++;
        } else {
            if (currentLength > maxLength) {
                maxLength = currentLength;
                bestStart = start;
            }
            currentLength = 1;
            start = i;
        }
    }

    if (currentLength > maxLength) {
        maxLength = currentLength;
        bestStart = start;
    }

    printf("Longest increasing subarray: ");
    for (int i = bestStart; i < bestStart + maxLength; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {1, 5, 4, 6, 0};
    int n = sizeof(arr) / sizeof(arr[0]);
    int max1 = arr[0];
    int max2 = arr[1];

    if (max2 > max1) {
        int temp = max1;
        max1 = max2;
        max2 = temp;
    }

    for (int i = 2; i < n; i++) {
        if (arr[i] > max1) {
            max2 = max1;
            max1 = arr[i];
        } else if (arr[i] > max2) {
            max2 = arr[i];
        }
    }

    printf("Maximum product: %d\n", max1 * max2);
    return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 4, 6, 3, 7, 8};
    int n = sizeof(arr) / sizeof(arr[0]);
    int N = 8;
    int present[N + 1];

    for (int i = 0; i <= N; i++) {
        present[i] = 0;
    }

    for (int i = 0; i < n; i++) {
        present[arr[i]] = 1;
    }

    for (int i = 1; i <= N; i++) {
        if (present[i] == 0) {
            printf("Missing number: %d\n", i);
            break;
        }
    }

    return 0;
}

#include <stdio.h>

int main() {
  int arr[] = {16, 17, 4, 3, 5, 2};
  int n = sizeof(arr) / sizeof(arr[0]);
  int max_from_right = arr[n - 1];

  printf("%d ", max_from_right);

  for (int i = n - 2; i >= 0; i--) {
    if (arr[i] > max_from_right) {
      max_from_right = arr[i];
      printf("%d ", max_from_right);
    }
  }
  printf("\n");
  return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {-7, 1, 5, 2, -4, 3, 0};
    int n = sizeof(arr) / sizeof(arr[0]);
    int leftSum, rightSum, i, j;

    for (i = 0; i < n; i++) {
        leftSum = 0;
        for (j = 0; j < i; j++) {
            leftSum += arr[j];
        }

        rightSum = 0;
        for (j = i + 1; j < n; j++) {
            rightSum += arr[j];
        }

        if (leftSum == rightSum) {
            printf("Equilibrium index: %d\n", i);
            return 0;
        }
    }

    printf("No equilibrium index found.\n");
    return 0;
}

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

#define MAX_SIZE 100

bool areArraysEqual(int arr1[], int arr2[], int size1, int size2) {
    if (size1 != size2) {
        return false;
    }

    int count[MAX_SIZE] = {0};

    for (int i = 0; i < size1; i++) {
        count[arr1[i]]++;
    }

    for (int i = 0; i < size2; i++) {
        count[arr2[i]]--;
    }

    for (int i = 0; i < MAX_SIZE; i++) {
        if (count[i] != 0) {
            return false;
        }
    }

    return true;
}

int main() {
    int arr1[] = {1, 2, 3, 4, 5};
    int arr2[] = {5, 4, 3, 2, 1};
    int size1 = sizeof(arr1) / sizeof(arr1[0]);
    int size2 = sizeof(arr2) / sizeof(arr2[0]);

    if (areArraysEqual(arr1, arr2, size1, size2)) {
        printf("Arrays are equal.\n");
    } else {
        printf("Arrays are not equal.\n");
    }

    return 0;
}

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

bool areArraysEqual(int arr1[], int arr2[], int size) {
    for (int i = 0; i < size; i++) {
        if (arr1[i] != arr2[i]) {
            return false;
        }
    }
    return true;
}

int main() {
    int arr1[] = {1, 2, 3, 4, 5};
    int arr2[] = {1, 2, 3, 4, 5};
    int size = sizeof(arr1) / sizeof(arr1[0]);

    if (areArraysEqual(arr1, arr2, size)) {
        printf("Arrays are equal.\n");
    } else {
        printf("Arrays are not equal.\n");
    }

    return 0;
}

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

bool isSortedAndRotated(int arr[], int n) {
    int i, minIndex = 0;
    for (i = 1; i < n; i++)
        if (arr[i] < arr[minIndex])
            minIndex = i;

    for (i = 1; i < n; i++)
        if (arr[(minIndex + i) % n] < arr[(minIndex + i - 1) % n])
            return false;

    return true;
}

int main() {
    int arr[] = {3, 4, 5, 1, 2};
    int n = sizeof(arr) / sizeof(arr[0]);

    if (isSortedAndRotated(arr, n))
        printf("Array is sorted and rotated\n");
    else
        printf("Array is not sorted and rotated\n");

    return 0;
}

#include <stdio.h>

void shiftNegative(int arr[], int n) {
 int j = 0;
 for (int i = 0; i < n; i++) {
 if (arr[i] < 0) {
 if (i != j) {
 int temp = arr[i];
 arr[i] = arr[j];
 arr[j] = temp;
 }
 j++;
 }
 }
}

int main() {
 int arr[] = {1, -2, 3, -4, 5, -6};
 int n = sizeof(arr) / sizeof(arr[0]);

 shiftNegative(arr, n);

 for (int i = 0; i < n; i++) {
 printf("%d ", arr[i]);
 }
 printf("\n");

 return 0;
}

#include <stdio.h>

void moveZerosToEnd(int arr[], int n) {
    int count = 0;
    for (int i = 0; i < n; i++) {
        if (arr[i] != 0) {
            arr[count++] = arr[i];
        }
    }
    while (count < n) {
        arr[count++] = 0;
    }
}

int main() {
    int arr[] = {0, 1, 0, 3, 12};
    int n = sizeof(arr) / sizeof(arr[0]);
    moveZerosToEnd(arr, n);
    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");
    return 0;
}

#include <stdio.h>

void leftRotate(int arr[], int n, int k) {
 int temp[k];
 for (int i = 0; i < k; i++) {
 temp[i] = arr[i];
 }
 for (int i = k; i < n; i++) {
 arr[i - k] = arr[i];
 }
 for (int i = 0; i < k; i++) {
 arr[n - k + i] = temp[i];
 }
}

int main() {
 int arr[] = {1, 2, 3, 4, 5, 6, 7};
 int n = sizeof(arr) / sizeof(arr[0]);
 int k = 2;
 leftRotate(arr, n, k);
 for (int i = 0; i < n; i++) {
 printf("%d ", arr[i]);
 }
 printf("\n");
 return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int n = sizeof(arr) / sizeof(arr[0]);
    int temp = arr[n - 1];

    for (int i = n - 1; i > 0; i--) {
        arr[i] = arr[i - 1];
    }

    arr[0] = temp;

    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");

    return 0;
}

#include <stdio.h>

void leftRotate(int arr[], int n) {
 int temp = arr[0];
 for (int i = 0; i < n - 1; i++) {
 arr[i] = arr[i+1];
 }
 arr[n-1] = temp;
}

int main() {
 int arr[] = {1, 2, 3, 4, 5};
 int n = sizeof(arr) / sizeof(arr[0]);

 leftRotate(arr, n);

 for (int i = 0; i < n; i++) {
 printf("%d ", arr[i]);
 }
 printf("\n");
 return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 4, 1, 2, 5};
    int size = sizeof(arr) / sizeof(arr[0]);
    int i, j, found = 0;

    for (i = 0; i < size; i++) {
        int count = 0;
        for (j = 0; j < size; j++) {
            if (arr[i] == arr[j]) {
                count++;
            }
        }
        if (count == 1) {
            printf("First non-repeating element: %d\n", arr[i]);
            found = 1;
            break;
        }
    }

    if (!found) {
        printf("No non-repeating element found.\n");
    }

    return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {10, 5, 3, 4, 3, 5, 6};
    int size = sizeof(arr) / sizeof(arr[0]);
    int i, j;

    for (i = 0; i < size; i++) {
        for (j = i + 1; j < size; j++) {
            if (arr[i] == arr[j]) {
                printf("First repeating element: %d\n", arr[i]);
                return 0;
            }
        }
    }

    printf("No repeating element found.\n");
    return 0;
}

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 1, 2, 4, 1, 5};
    int size = sizeof(arr) / sizeof(arr[0]);
    int freq[100] = {0}; 

    for (int i = 0; i < size; i++) {
        freq[arr[i]]++;
    }

    for (int i = 0; i < 100; i++) {
        if (freq[i] > 0) {
            printf("Element %d: %d\n", i, freq[i]);
        }
    }

    return 0;
}

#include <stdio.h>
#include <limits.h>

int main() {
    int arr[] = {12, 35, 1, 10, 34, 1};
    int n = sizeof(arr) / sizeof(arr[0]);

    int largest = INT_MIN, secondLargest = INT_MIN;
    int smallest = INT_MAX, secondSmallest = INT_MAX;

    for (int i = 0; i < n; i++) {
        if (arr[i] > largest) {
            secondLargest = largest;
            largest = arr[i];
        } else if (arr[i] > secondLargest && arr[i] != largest) {
            secondLargest = arr[i];
        }

        if (arr[i] < smallest) {
            secondSmallest = smallest;
            smallest = arr[i];
        } else if (arr[i] < secondSmallest && arr[i] != smallest) {
            secondSmallest = arr[i];
        }
    }

    printf("Second Largest: %d\n", secondLargest);
    printf("Second Smallest: %d\n", secondSmallest);

    return 0;
}