HBC24569带富翁[USACO 2014 Jan S]Cross Country Skiing题解

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The cross-country skiing course at the winter Moolympics is described by an M x N grid of elevations (1

The cross-country skiing course at the winter Moolympics is described by an M x N grid of elevations (1 <= M,N <= 500), each elevation being in the range 0 .. 1,000,000,000. Some of the cells in this grid are designated as waypoints for the course. The organizers of the Moolympics want to assign a difficulty rating D to the entire course so that a cow can reach any waypoint from any other waypoint by repeatedly skiing from a cell to an adjacent cell with absolute elevation difference at most D. Two cells are adjacent if one is directly north, south, east, or west of the other. The difficulty rating of the course is the minimum value of D such that all waypoints are mutually reachable in this fashion.

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标签： HBC24569带富翁[USACO 2014 Jan S]Cross Country Skiing题解