107. Binary Search in Sorted Array

#include <stdio.h>
#include <stdint.h>

int binary_search(uint8_t *arr, uint8_t n, uint8_t key) {
    uint8_t start=0,end=n-1;
    while(start<=end){
        if(arr[start]==key) return start;
        else if(arr[end]==key) return end; 
        start++,end--;
        }
    return -1;
}

int main() {
    uint8_t n, key;
    scanf("%hhu", &n);
    uint8_t arr[100];

    for (uint8_t i = 0; i < n; i++) {
        scanf("%hhu", &arr[i]);
    }
    scanf("%hhu", &key);

    int index = binary_search(arr, n, key);
    printf("%d", index);
    return 0;
}