#grid search

[jakehines]

Recent commission shot for Grid Search

[jalph]

[flipyourwigmedia-blog]

[xxxmind]

Grid Search

* This problem is from HackerRank.com

Given a 2D array of digits, try to find the occurrence of a given 2D pattern of digits. For example, consider the following 2D matrix:

1234567890   0987654321   1111111111   1111111111   2222222222  

Assume we need to look for the following 2D pattern:

876543   111111   111111

If we scan through the original array, we observe that the 2D pattern begins at the second row and the third column of the larger grid (the 88 in the second row and third column of the larger grid is the top-left corner of the pattern we are searching for).

So, a 2D pattern of PP digits is said to be present in a larger grid GG, if the latter contains a contiguous, rectangular 2D grid of digits matching with the pattern PP, similar to the example shown above.

Input Format The first line contains an integer, TT, which is the number of test cases. TT test cases follow, each having a structure as described below: The first line contains two space-separated integers, RR and CC, indicating the number of rows and columns in the grid GG, respectively. This is followed by RR lines, each with a string of CC digits, which represent the grid GG. The following line contains two space-separated integers, rr and cc, indicating the number of rows and columns in the pattern grid PP. This is followed by rr lines, each with a string of cc digits, which represent the pattern PP.

Constraints 1≤T≤51≤T≤5 1≤R,r,C,c≤10001≤R,r,C,c≤1000 1≤r≤R1≤r≤R 1≤c≤C1≤c≤C

Test Case Generation Each individual test case has been generated by first specifying the size (RR and CC) of the large 2D matrix, and then randomly generating the digits in it. A limited number of digits in the larger matrix may be changed by the problem setter (no more than 5% of the total number of digits in the matrix). So the larger 2D matrix is almost-random. The pattern matrix has been manually-curated by the problem setter.

Output Format Display 'YES' or 'NO', depending on whether (or not) you find that the larger grid GG contains the rectangular pattern PP. The evaluation will be case sensitive.

#!/bin/python3

import sys

def findPattern( grid, pattern ):        sLine = pattern[ 0 ]    for iRow, sGridLine in enumerate( grid ):        if iRow + len( pattern ) > len( grid ): break        iColumn = -1        while True:            iColumn = sGridLine.find( sLine, iColumn + 1 )            if iColumn < 0 or iColumn + len( sLine ) > len( sGridLine ):                break

           for i, sPatternLine in enumerate( pattern[ 1: ] ):                if grid[ iRow + 1 + i ][ iColumn : iColumn + len( sPatternLine ) ] != sPatternLine:                    break            else:                return True

   return False

t = int(input().strip()) for a0 in range(t):    R,C = input().strip().split(' ')    R,C = [int(R),int(C)]    G = []    G_i = 0    for G_i in range(R):       G_t = str(input().strip())       G.append(G_t)    r,c = input().strip().split(' ')    r,c = [int(r),int(c)]    P = []    P_i = 0    for P_i in range(r):       P_t = str(input().strip())       P.append(P_t)

   bFound = findPattern( G, P )

   print('YES' if bFound else 'NO')

전체 배열을 순회하며 검색하여야할 배열의 첫째 열의 문자열을 포함하는지 알아본다.

포함하지 않는다면, 다음 전체 배열의 다음 줄로 간다.

포함한다면, 다음 열의 같은 행부터 검색할 배열의 문자열과 같은 길이의 문자열이 검색할 배열의 다음 열과 같은지 비교한다.  이것을 검색할 배열의 모든 열에 대하여 비교하고 이것이 모두 일치한다면, 검색하고자 하는 배열이 존재 하는 것이다.  

주의하여야할 점은 검색할 배열의 문자열이 전체 배열의 같은 열에서 여러번 반될 수 있다.  위 코드에서 while True 부분이 같은 열에서 여러번 찾도록 해준다.

[katerealta]

Guide how to remove Grid Search from the computer and browsers: manual and automatic uninstall methods

[techiemedotin]

Pattern Search in Grid

Pattern Search in Grid

Problem Statement

Given a huge grid G with M rows and N columns and a pattern P with m rows and n columns. The task at hand is to perform a pattern search in grid, and print YES if the pattern grid P exists in the grid G otherwise print NO

Pattern Search in Grid

Its a simple string search but requires special attention to the boundary cases. Here is a list of them

We only need to test the grid Gf…

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[charlesmccain]

American Destroyers USS Pinckney & USS Kidd Aiding in Search For Missing Malaysia Airlines Jet

American Destroyers USS Pinckney & USS Kidd Aiding in Search For Missing Malaysia Airlines Jet

  US Navy Warships and Aircraft Part of International Effort to Locate Missing Malaysia Airlines Jet 

  USS Pinckney (DDG-91) is assigned to the US Navy’s 7th Fleet. She is an Arleigh Burke-class destroyer. She is named for Cook First Class William Pinckney (1915–1975), who received the Navy Cross for his courageous rescue of a fellow crewmember on board Enterprise (CV-6) during the Battle of…

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[shndsf-blog]

Lego NXT Robot - Path Planning using Grid Search Algorithm