feat: solutions for day 01

01/01_forAdvanced.tbasic

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+' This solution is faster, with more advanced tricks
+
+uses "file", "console"
+
+string input = file_load("data.txt")    
+input = rtrim$(input, $LF)                    
+
+printl GetCaptcha(input, 1)
+printl GetCaptcha(input, len(input)/2)
+waitkey   
+
+function GetCaptcha(input as string, lookupOffset as long)
+  ' This overlays BYTE array over STRING memory
+  byte ascii(len(input)) at strptr(input)
+  long indexA, indexB, result, valueA, valueB, addedTimes  
+
+  for indexA = 1 to len(input)
+    ' Reading ASCII value of character at position
+    valueA = ascii(indexA)
+
+    indexB = indexA + lookupOffset
+    while indexB > len(input)
+      ' Short for indexB = indexB - len(input)
+      indexB -= len(input)
+    wend
+
+    valueB = ascii(indexB)
+
+    if valueA = valueB then
+      result += valueA
+      incr addedTimes ' Optimized addition of 1 to variable
+    end if
+  next
+
+  result -= 48 * addedTimes ' Because ASCII of 0 starts as 48
+                            ' This is faster than subtracting 48 each time
+                            ' from ASCII value of indexA, indexB
+  return result
+
+end function

01/01_forBeginners.tbasic

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+' This solution is very simplistic, unoptimized, makes one cry
+
+uses "file", "console"
+
+string input = file_load("data.txt")    
+input = rtrim$(input, $LF)                    
+
+printl GetCaptcha(input, 1)
+printl GetCaptcha(input, len(input)/2)
+waitkey   
+
+function GetCaptcha(input as string, lookupOffset as long)
+
+  long indexA, indexB, result, valueA, valueB
+
+  for indexA = 1 to len(input)
+    valueA = val(mid$(input, indexA, 1))
+
+    indexB = indexA + lookupOffset
+    while indexB > len(input)
+      indexB = indexB - len(input)
+    wend
+
+    valueB = val(mid$(input, indexB, 1))
+
+    if valueA = valueB then
+      result = result + valueA
+    end if
+  next
+
+  return result
+
+end function

01/data.txt

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+7385764686251444473997915123782972536343732657517834671759462795461213782428342931896181695578996274321317419242359534783957372932953774336338118488967172727651862498838195317654289797558683458511126996217953322817229372373455862177844478443391835484591525235651863464891177927244954925827786799436536592561374269299474738321293575385899438446558569241236278779779983587912431395475244796538888373287186921647426866237756737342731976763959499149996315591584716122199183295277439872911371313924594486766479438544417416529743495114819825984524437367225234184772617942525954961136976875325182725754768372684531972614455134523596338355374444273522115362238734383164778129376628621497662965456761631796178353599629887665939521892447361219479646483978798392716119793282717739524897385958273726776318154977675546287789874265339688753977185129334929715486381875286278528247696464162297691698154712775589541945263574897266575996455547625537947927972497979333932115165151462742216327321116291372396585618664475715321298122335789262942284571328414569375464386446824882551918843185195829547373915482687534432942778312542752798313434628498295216692646713137244198123219531693559848915834623825919191532658735422176965451741869666714874158492556445954852299161868651448123825821775363219246244515946392686275545561989355573946924767442253465342753995764791927951158771231944177692469531494559697911176613943396258141822244578457498361352381518166587583342233816989329544415621127397996723997397219676486966684729653763525768655324443991129862129181215339947555257279592921258246646215764736698583211625887436176149251356452358211458343439374688341116529726972434697324734525114192229641464227986582845477741747787673588848439713619326889624326944553386782821633538775371915973899959295232927996742218926514374168947582441892731462993481877277714436887597223871881149693228928442427611664655772333471893735932419937832937953495929514837663883938416644387342825836673733778119481514427512453357628396666791547531814844176342696362416842993761919369994779897357348334197721735231299249116477

README.md

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+# Advent of Code 2017, thinBASIC edition
+
+This repository stores examples of solutions for [Advent of Code 2017](http://adventofcode.com/2017) challenge.
+
+
+Let's explore where thinBASIC shines and on what ideas we need to work on.