摘要：题目描述： There are n houses in a village. We want to supply water for all the houses by building wells and laying pipes. For each house i, we can either 阅读全文

摘要：题目描述： Given an N x N grid containing only values 0 and 1, where 0 represents water and 1represents land, find a water cell such that its distance to t 阅读全文