Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100…
Given a non-empty array of integers, every element appears three times except for one, which appears exactly once. Find that single one. Note: Your…
The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists…
There are n cities connected by m flights. Each flight starts from city u and arrives at v with a price w. Now…
Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer…
Suppose you have a random list of people standing in a queue. Each person is described by a pair of…
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water…
Given a collection of intervals, merge all overlapping intervals. Example 1: Input: [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6],[8,10],[15,18]] Explanation: Since intervals [1,3] and…
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Example: Input: [ 1->4->5,…
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