C++

… Read More »LeetCode: 895-Maximum Frequency Stack 解題紀錄

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Given a string s, remove duplicate letters so that every letter appears once and only once. You must make sure your result is the smallest in lexicographical order among all possible results.

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Given a balanced parentheses string s, return the score of the string.

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… Read More »LeetCode: 138-Copy List with Random Pointer 解題紀錄

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Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. Return the linked list sorted as well.

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Given an integer n, return an array ans of length n + 1 such that for each i (0 <= i <= n), ans[i] is the number of 1's in the binary representation of i.