1228. Pizza delivery

单点时限: 2.0 sec

内存限制: 256 MB

Your Irish pizza and kebab restaurant is doing very well. Not only is the restaurant full almost every night, but there is also an ever increasing number of deliveries to be made, all over town. To meet this demand, you realize that it will be necessary to separate the delivery service from the restaurant. A new large kitchen, only for baking pizzas and being a base for deliveries, has to be established somewhere in town.

The main cost in the delivery service is not the making of the pizza itself, but the time it takes to deliver it. To minimize this, you need to carefully plan the location of the new kitchen. To your help you have a database of all last year’s deliveries. For each block in the city, you know how many deliveries were made there last year. The kitchen location will be chosen based on the assumption that the pattern of demand will be the same in the future.

Your city has a typical suburban layot-an orthogonal grid of equal-size square blocks. All places of interest (delivery points and the kitchen) are considered to be located at street crossings. The distance between two street crossings is the Manhattan distance, i.e., the number of blocks you have to drive vertically, plus the enumber of blocks you have to drive horizontally .The total cost for a delivery point is its Manhattan distance from the kitchen, times the number of deliveries to the point. Note that we are only counting the distance from the kitchen to the delivery point. Even though we always drive directly back to the kitchen after a delivery is made, this (equal) distance is not included in the cost measure.


On the first line, there is a number, 1 <= n <= 20, indicating the number of test cases. Each test case begins with a line with two integers, 1 <= x <= 100, 1 <= y <= 100, indicating the size of the two-dimenstional street grid. Then follow y lines, each with x integers, 0 <= d <= 1000, indicating the number of deliveries made to each street crossing last year.


For each test case, output the least possible total delivery cost (the sum of all delivery costs last year), assuming that the kitchen was located optimally. There should be one line for each test case, with an integer indicating the cost, followed by a single space and the word ‘blocks’.


4 4
0 8 2 0
1 4 5 0
0 1 0 1
3 9 2 0
6 7
0 0 0 0 0 0
0 1 0 3 0 1
2 9 1 2 1 2
8 7 1 3 4 3
1 0 2 2 7 7
0 1 0 0 1 0
0 0 0 0 0 0
55 blocks
162 blocks

20 人解决,21 人已尝试。

21 份提交通过,共有 28 份提交。

3.1 EMB 奖励。

创建: 13 年,2 月前.

修改: 2 年,11 月前.

最后提交: 1 周前.

来源: NCPC 2004