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Task/ABC-Problem/Batch-File/abc-problem.bat

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+@echo off
+::abc.bat
+::
+::Batch file to evaluate if a given string can be represented with a set of
+::20 2-faced blocks.
+::
+
+::Check if a string was provided
+if "%1"=="" goto ERROR
+
+::Define blocks. Separate blocks by ':', and terminat with '::'
+set "FACES=BO:XK:DQ:CP:NA:GT:RE:TG:QD:FS:JW:HU:VI:AN:OB:ER:FS:LY:PC:ZM::"
+set INPUT=%1
+set "COUNTER=0"
+
+::The main loop steps through the input string, checking if an available
+::block exists for each character
+:LOOP_MAIN
+
+  ::Get character, increase counter, and test if there are still characters
+  call set "char=%%INPUT:~%COUNTER%,1%%"
+  set /a "COUNTER+=1"
+  if "%CHAR%"=="" goto LOOP_MAIN_END
+
+  set "OFFSET=0"
+  :LOOP_2
+
+    ::Read in two characters (one block)
+    call set "BLOCK=%%FACES%:~%OFFSET%,2%%"
+
+    ::Test if the all blocks were checked. If so, no match was found
+    if "%BLOCK%"==":" goto FAIL
+
+    ::Test if current input string character is in the current block
+    if /i "%BLOCK:~0,1%"=="%CHAR%" goto FOUND
+    if /i "%BLOCK:~1,1%"=="%CHAR%" goto FOUND
+
+    ::Increase offset to point to the next block
+    set /a "OFFSET+=3"
+
+  goto LOOP_2
+  :LOOP_2_END
+
+  ::If found, blank out the block used
+  :FOUND
+  call set "FACES=%%FACES:%BLOCK%:=  :%%"
+
+goto LOOP_MAIN
+:LOOP_MAIN_END
+
+echo %0: It is possible to write the '%INPUT%' with my blocks.
+goto END
+
+:FAIL
+echo %0: It is NOT possible to write the '%INPUT%' with my blocks.
+goto END
+
+:ERROR
+echo %0: Please enter a string to evaluate
+echo.
+
+:END