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Problem B. Painting the Wall题意：有一个n*m的墙，0为灯，不能涂颜料，1为瓷砖。问用k种颜色的颜料，使得连通的线段上没有重复的颜色。

[ 题目链接 ] A long-distance telephone company charges its customers by the following rules: Making a long-distance call costs a certain amount per minute, depending on the time of day when the call is...

题目链接 Suppose a bank has N windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. The rules for the customers to wait in line are: The...

题目链接 Suppose a bank has K windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. All the customers have to wait in line behind the yel...