sort algorithm

n^2 sort

class Solution:
    """
    @param a: an integer array
    @return: nothing
    """
    def sort_integers1(self, a):
        # selection sort
        n = len(a)
        for i in range(n-1):
            # 在每轮比较中，将i 与 j(i之后的所有数) 进行比较，保证i是[i...]中最小值
            for j in range(i+1, n):
                if a[i] > a[j]:
                    a[i], a[j] = a[j], a[i]
        

    def sort_integers(self, a):
        # bubble sort
        n = len(a)
        for i in range(n-1):
            # 在每轮比较中，保证j和相邻的j+1是升序的
            for j in range(n-1):
                if a[j] > a[j+1]:
                    a[j], a[j+1] = a[j+1], a[j]