本来以为这题很简单,但是看要求,第一不能改变这个数组,第二只能使用O(1)的空间,第三时间复杂度小于O(n^2),就不能使用遍历数组的方式来解决了。 有两种方法,一种是利用Binary Search,一种是利用Floyd的cycle detection算法。 Binary Search M...
133 Clone Graph Python Hash and DFS or BFS 136 Single Number Python 1. Hash or set, O(n) and O(n)2. xor O(n) and O(1) 137 Single Number II Python 1. ctypes 32 % 3 and &, O(n) and O(1)2. ones, twos, threes as bitmask (e.g. ones represents ith bit had appeared on...
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Graph 2 Graph 3 As shown in Graph 2 and Graph 3, the extension stops when we encounter a shorter bar or the boundary of array. The largest rectangle generated with h2is filled by red dash, and we can see that we cannot extend it any more because 5 and 3 are all less than 13. Th...
The core concept behind the solution is the Floyd’s Tortoise and Hare algorithm for cycle detection. Big O Notation: Time complexity:The time complexity of this solution is O(n), where n is the size of the input array. This is because we are traversing the array a couple of times, ...
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