Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order. All of the tickets belong to a man who departs from JFK. Thus,…

Given an m x n matrix of non-negative integers representing the height of each unit cell in a continent, the “Pacific ocean” touches the left and top edges of the matrix and the “Atlantic ocean” to…

假设现在有两个杯子，每个杯子分别最多可以装x和y升水，假设现在水的供应量是无限的，问是否有可能用这两个杯子共同承装z升水，可以用两个杯子执行的操作如下：