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 n non-negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of…
Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order.…
Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum…
Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'. '.' Matches any single…
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which…
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