objective-c - C语言冒泡排序

#include 

#define Max  5
int main(int argc, const char * argv[]) {
    int  a[Max] = {22,16,80,1,10};
    int time = 0;
    int count = 0;
    
    for (int i = 0; i < Max - 1 ; i++) {
        for (int j = 0; j < (Max - 1 - i); j++) {
            time++;
            if (a[j] > a[j+1] ) {
                int tmp;
                tmp = a[j];
                a[j] = a[j+1];
                a[j+1] = tmp;
                count++;
            }
        }
    }
    printf("交换次数%d\n",count);
    printf("执行次数%d\n",time);
    //遍历
    for (int i = 0 ; i < Max; i++) {
        printf("%d ",a[i]);
    }
    return 0;
}

Question ： 
1.我这已经是最优的了吧
2.第二个for循环的j条件，为什么要设置成 Max - i - 1 ，Max表示数组长度.