摘要：
Given a number of different denominations of coins (e.g., 1 cent, 5 cents, 10 cents, 25 cents), get all the possible ways to pay a target number of ce 阅读全文
posted @ 2020-02-16 11:43
xuan_abc
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摘要：
Given N pairs of parentheses “()”, return a list with all the valid permutations. Assumptions N > 0 Examples N = 1, all valid permutations are ["()"] 阅读全文
posted @ 2020-02-16 11:00
xuan_abc
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Given a string, remove all leading/trailing/duplicated empty spaces. Assumptions: The given string is not null. Examples: “ a” --> “a” “ I love MTV ” 阅读全文
posted @ 2020-02-16 05:57
xuan_abc
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Given a matrix of size N x M. For each row the elements are sorted in ascending order, and for each column the elements are also sorted in ascending o 阅读全文
posted @ 2020-02-16 04:04
xuan_abc
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摘要：
Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twi 阅读全文
posted @ 2020-02-16 00:33
xuan_abc
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