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Medium? Seriously? Well again, always smart solutions out there: https://discuss.leetcode.com/topic/77889/3-line-python-solution 阅读全文
posted @ 2017-02-10 05:07
Tonix
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Isn't it 'Easy'? 阅读全文
posted @ 2017-02-01 01:31
Tonix
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It is a matter of hashmap use. For the follow-up: 阅读全文
posted @ 2017-01-31 08:06
Tonix
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A more programming-like solution, is to hack the problem from simple: we try each possble base value, and see which 111..11 fits target number - using 阅读全文
posted @ 2017-01-31 07:35
Tonix
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Check out this brilliant solution:https://discuss.leetcode.com/topic/70658/concise-java-solution-using-dp My first solution was a O(n^2) typical DP bo 阅读全文
posted @ 2017-01-28 15:24
Tonix
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The punch line of this one: sum of leaves: pi..pj = root..pj - root..pi. 阅读全文
posted @ 2017-01-28 14:44
Tonix
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Split it into 2 group of arrays, 2 arrays in each group. Then use hashmap. class Solution { public: int fourSumCount(vector<int>& A, vector<int>& B, v 阅读全文
posted @ 2017-01-27 07:45
Tonix
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A natural stack based solution. Seriously, whey 'Medium'? /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * 阅读全文
posted @ 2017-01-27 06:21
Tonix
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Check this out: https://discuss.leetcode.com/topic/76312/java-1-line-recursion-solution Neat thoughts with neat code. Bravo. Deserve to learn. 阅读全文
posted @ 2017-01-26 14:48
Tonix
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Simple greedy thought .. satify each kid with minimum qualified cookie, from the least greedy kid.. 阅读全文
posted @ 2017-01-24 12:52
Tonix
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Idea is, among all factors of the int, we pick the two that is the closest pair. And searching from sqrt(area) is a better idea: https://discuss.leetc 阅读全文
posted @ 2017-01-24 11:05
Tonix
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I prefer shorter code, so this one:https://discuss.leetcode.com/topic/75448/memoization-c-solution Please note: we don't want to be too greedy - despe 阅读全文
posted @ 2017-01-22 12:08
Tonix
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Yes the most concise solution is recursion.https://discuss.leetcode.com/topic/66165/very-concise-c-solution-for-general-binary-tree-not-only-bst Here 阅读全文
posted @ 2017-01-21 15:35
Tonix
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Natural Greedy. Sort the array and pick the medium as target. 阅读全文
posted @ 2017-01-14 14:40
Tonix
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Fun one. A matter of string generation by given rules. I know it can be much shorter.. but i'm lazy to do that. 阅读全文
posted @ 2017-01-14 13:50
Tonix
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Mediocre solution is O(nlgn) by using max-heap - but, remember bucket sort? it is O(n) 阅读全文
posted @ 2017-01-10 13:12
Tonix
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This problem reflects a key strategy when dealing with discrete problem space - split split split.. That' is to say, we check each house and find its 阅读全文
posted @ 2017-01-09 14:20
Tonix
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Brutal force works - and a smarter way is to utilize KMP. The most popular two solutions are essentially the same - one is obvious KMP, and another on 阅读全文
posted @ 2017-01-08 09:26
Tonix
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it is all about corner-cases... 阅读全文
posted @ 2017-01-07 09:06
Tonix
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A trickier DFS, with a little bit complex recursion param tweak, and what's more important is pruning strategies.. or your code will TLE. 阅读全文
posted @ 2017-01-07 06:21
Tonix
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