查找未排序数组中的所有对,其总和可以除以4.请建议一个比O(n*n)更好的算法
e.g. [1,2,4,0,20,22] k=4 [0,4] [0,20] [20,4] [2,22]
arrays algorithm big-o time-complexity
algorithm ×1
arrays ×1
big-o ×1
time-complexity ×1