上周刚onsite结束，之前店面了两轮， 每轮一小时都是写代码。第一轮给一个2Dmatrix，matrix里每一个值代表cost， 问从第一行到最后一行的路径里最短cost是多少，并输出这个路径。注意start/end point并没有指定，只说第一行开始，最后一行结束。
第二轮问了简历然后code filter convolution in an image.
onsite, four interviews：
research experience
LRU
given a 2D matrix with cost, with 1 position of an user, and 4 positions of cars, find the car with min cost to the user
euclidean clustering: given a cluster of points and a threshold T, at each time label the neighboring pts with distance <=T until you cannot label the pts anymore