Maximum value of every contiguous subarray - c

Question

Given an unsorted array A[0...n-1] of integers and an integer k; the desired algorithm in C should calculate the maximum value of every contiguous subarray of size k. For instance, if A = [8,5,10,7,9,4,15,12,90,13] and k=4, then findKMax(A,4,10) returns 10 10 10 15 15 90 90.
My goal is to implement the algorithm as a C programm that reads the elements of A, reads k and then prints the result of the function findKMax(A,4,10). An input/output example is illustrated bellow (input is typeset in bold):
Elements of A: 8 5 10 7 9 4 15 12 90 13 end
Type k: 4
Results: 10 10 10 15 15 90 90
What I've tried so far? Please keep in mind that I am an absolute beginner in C. Here is my code:
#include <stdio.h>
void findKMax(int A[], int k, int n) {
int j;
int max;
for (int i = 0; i <= n-k; i++) {
max = A[i];
for (j = 1; j < k; j++) {
if (A[i+j] > max)
max = A[i+j];
}
}
}
int main() {
int n = sizeof(A);
int k = 4;
printf("Elements of A: ");
scanf("%d", &A[i]);
printf("Type k: %d", k);
printf("Results: %d", &max);
return 0;
}
Update March 17th:
I've modified the source code, i.e. I've tried to implement the hints of Michael Burr and Priyansh Goel. Here is my result:
#include <stdio.h>
// Returning the largest value in subarray of size k.
void findKMax(int A[], int k, int n) {
int j;
int largestValueOfSubarray;
for (int i = 0; i <= n-k; i++) {
largestValueOfSubarray = A[i];
for (j = 1; j < k; j++) {
if (A[i+j] > largestValueOfSubarray)
largestValueOfSubarray = A[i+j];
}
printf("Type k: %d", k);
}
return largestValueOfSubarray;
}
int main() {
int n = 10;
int A[n];
// Reading values into array A.
for (int i = 0; i < n; i++) {
printf("Enter the %d-th element of the array A: \n", i);
scanf("%d", &A[i]);
}
// Printing of all values of array A.
for (int i = 0; i < n; i++) {
printf("\nA[%d] = %d", i, A[i]);
}
printf("\n\n");
// Returning the largest value in array A.
int largestValue = A[0];
for (int i = 0; i < n; i++) {
if (A[i] > largestValue) {
largestValue = A[i];
}
}
printf("The largest value in the array A is %d. \n", largestValue);
return 0;
}
I guess there is not so much to code. Can anybody give me a hint how to do the rest. I need an advice how to "combine" the pieces of code into a running program.

Answer 1

Since you are a beginner, lets begin with the simplest algorithm.
for every i, you need to find sum of k continous numbers starting from that i. And then find the max of it.
Before that you need to see how to take input to an array.
int n;
scanf("%d",&n);
int a[n];
for(int i = 0; i < n; i++) {
scanf("%d",&a[i]);
}
Also, you will need to call the function findKMax(a,n,k);
In your findKMax function, you have to implement the algorithm that I mentioned.
I will not provide the code so that you may try on your own. If you face any issue, do tell me.
HINT : You need to use nested loops.

Answer 2

You find max value in window many times, but output only the last max value.
The simplest correction - add output in the end of main cycle:
for (int i = 0; i <= n-k; i++) {
max = A[i];
for (j = 1; j < k; j++) {
if (A[i+j] > max)
max = A[i+j];
}
printf("Type k: %d", k);
}
The next step - collect all local max values in a single string "10 10 10 15 15 90 90" or additional array of length n-k+1: [10,10,10,15,15,90,90] and print it after the main cycle (I don't know the best approach for this in C)