【tip】翻转数组方法

void swap(int *a, int *b) {
    int t = *a;
    *a = *b;
    *b = t;
}

void reverse(int *nums, int start, int end) {
    while (start < end) {
        swap(&nums[start], &nums[end]);
        start++;
        end--;
    }
}

yo peace！