编辑代码

#include <stdio.h>
int get_max(int* arr, int left, int right) {
    int max_left = 0, max_right = 0, middle = 0;
    if (arr == NULL) {
        return  -1;
    }
    if (right - left == 0) {
        return arr[left];
    }
    if (right - left <= 1) {
        if (arr[left] >= arr[right]) {
            return arr[left];
        }
        return  arr[right];
    }
    middle = (right - left) / 2 + left;
    max_left = get_max(arr, left, middle);
    max_right = get_max(arr, middle + 1, right);
    if (max_left >= max_right) {
        return  max_left;
    }
    else {
        return max_right;
    }
}
int main() {
    int arr[4] = { 3,7,2,1 };
    int max = get_max(arr, 0, 3);
    printf("最大值：%d", max);
    return 0;
}
}