BYTESM2 - Philosophers Stone


One of the secret chambers in Hogwarts is full of philosopher’s stones. The floor of the chamber is covered by h × w square tiles, where there are h rows of tiles from front (first row) to back (last row) and w columns of tiles from left to right. Each tile has 1 to 100 stones on it. Harry has to grab as many philosopher’s stones as possible, subject to the following restrictions:

  • He starts by choosing any tile in the first row, and collects the philosopher’s stones on that tile. Then, he moves to a tile in the next row, collects the philosopher’s stones on the tile, and so on until he reaches the last row.
  • When he moves from one tile to a tile in the next row, he can only move to the tile just below it or diagonally to the left or right.
Given the values of h and w, and the number of philosopher’s stones on each tile, write a program to compute the maximum possible number of philosopher’s stones Harry can grab in one single trip from the first row to the last row.

Input

The first line consists of a single integer T, the number of test cases. In each of the test cases, the first line has two integers. The first integer h (1 <= h <= 100) is the number of rows of tiles on the floor. The second integer w (1 <= w <= 100) is the number of columns of tiles on the floor. Next, there are h lines of inputs. The i-th line of these, specifies the number of philosopher’s stones in each tile of the i-th row from the front. Each line has w integers, where each integer m (0 <= m <= 100) is the number of philosopher’s stones on that tile. The integers are separated by a space character.

Output

The output should consist of T lines, (1 <= T <= 100), one for each test case. Each line consists of a single integer, which is the maximum possible number of philosopher’s stones Harry can grab, in one single trip from the first row to the last row for the corresponding test case.

Example

Input:
1
6 5
3 1 7 4 2
2 1 3 1 1
1 2 2 1 8
2 2 1 5 3
2 1 4 4 4
5 2 7 5 1

Output:
32 	

//7+1+8+5+4+7=32

hide comments
Timmy Jose: 2015-11-29 20:47:58

My obviously greedy approach did not pass muster beyond the given test case. Clearly I need to learn DP now. Good motivation though!

munjal: 2015-10-24 19:13:30

gives TLE with memorization technique in java
,,,, Question is easy though....

Gustav: 2015-10-18 13:40:52

************
* WARNING *
************
Don't use any other language than C++.
Input is malformed, but if you use IOStreams in C++ it won't matter.

nietaki: 2015-10-18 03:42:11

The input is malformed - don't waste your time on this problem, or write your solution in a way that doesn't depend on the locations of new lines and space counts.

The situation makes me think SPOJ needs a mechanism for reporting ill-conceived problems (and problem creators).

vijay meena: 2015-10-14 08:45:33

Ac in one go ! easy dp just use bottom up

Akshay Damle: 2015-10-13 14:33:06

Don't try this in Python. The input format is wrong.

Abishek: 2015-09-17 12:45:12

wow .. learning the power of dp with problems like these ...awesome one :)

Vivek: 2015-09-07 21:58:52

Very easy problem.
Just take care when at the start of row,then can only jump to same col or right col
and at the end of row,then can only jump to left col or same col.
No DP and No auxiliary space required,although seems like one.

Surendra : 2015-08-28 11:06:06

can any one give the other test cases pls

anuveshkothari: 2015-08-27 14:44:31

@iammangod96 comment helps


Added by:Paritosh Aggarwal
Date:2009-02-21
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
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