Add day 14

d14.lua

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+recipes = {}
+
+for line in io.lines(arg[1]) do
+    input, output = line:match("(.-) *=> *(.+)")
+    quant, name = output:match("(%d+) +(.+)")
+    recipe = {quant=tonumber(quant), ingres={}}
+    for quant, ingre in input:gmatch("(%d+) +(%a+),? *") do
+        recipe.ingres[ingre] = quant
+    end
+    recipes[name] = recipe
+end
+
+recipes.ORE = {quant=0, ingres={}}
+
+function get_ore(fuel)
+    local wanted = {FUEL=fuel}
+    while true do
+        for name, _ in pairs(wanted) do
+            if name ~= "ORE" then
+                recipe = recipes[name]
+                if wanted[name] > 0 then
+                    amount = wanted[name] // recipe.quant
+                    if wanted[name] % recipe.quant > 0 then
+                        amount = amount + 1
+                    end
+                    for ingre, ingre_quant in pairs(recipe.ingres) do
+                        if not wanted[ingre] then
+                            wanted[ingre] = 0
+                        end
+                        wanted[ingre] = wanted[ingre] + ingre_quant * amount
+                    end
+                    wanted[name] = wanted[name] - recipe.quant * amount
+                end
+            end
+        end
+
+        if wanted["ORE"] then
+            count = 0
+            for x, y in pairs(wanted) do if 0 < y then count = count + 1 end end
+            if count == 1 then
+                return wanted["ORE"]
+            end
+        end
+    end
+end
+
+-- Manual brute forcing is actually doable, funnily enough
+ore = get_ore(tonumber(arg[2]))
+print(ore)
+if ore > 1000000000000 then
+    print("Ding!")
+end

d14_input.txt

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+180 ORE => 9 DQFL
+3 HGCR, 9 TKRT => 8 ZBLC
+1 MZQLG, 12 RPLCK, 8 PDTP => 8 VCFX
+3 ZBLC, 19 VFZX => 1 SJQL
+1 CRPGK => 4 TPRT
+7 HGCR, 4 TGCW, 1 VFZX => 9 JBPHS
+8 GJHX => 4 NSDBV
+1 VFTG => 2 QNWD
+1 WDKW, 2 DWRH, 6 VNMV, 2 HFHL, 55 GJHX, 4 NSDBV, 15 KLJMS, 17 KZDJ => 1 FUEL
+2 JHSJ, 15 JNWJ, 1 ZMFXQ => 4 GVRK
+1 PJFBD => 3 MZQLG
+1 SJQL, 11 LPVWN => 9 DLZS
+3 PRMJ, 2 XNWV => 6 JHSJ
+4 SJQL => 8 PJFBD
+14 QNWD => 6 STHQ
+5 CNLFV, 2 VFTG => 9 XNWV
+17 LWNKB, 6 KBWF, 3 PLSCB => 8 KZDJ
+6 LHWZQ, 5 LWNKB => 3 ZDWX
+5 RPLCK, 2 LPVWN => 8 ZMFXQ
+1 QNWD, 2 TKRT => 3 CRPGK
+1 JBPHS, 1 XNWV => 6 TLRST
+21 ZDWX, 3 FZDP, 4 CRPGK => 6 PDTP
+1 JCVP => 1 WXDVT
+2 CRPGK => 9 FGVL
+4 DQFL, 2 VNMV => 1 HGCR
+2 GVRK, 2 VCFX, 3 PJFBD, 1 PLSCB, 23 FZDP, 22 PCSM, 1 JLVQ => 6 HFHL
+1 CRPGK, 5 PJFBD, 4 XTCP => 8 PLSCB
+1 HTZW, 17 FGVL => 3 LHWZQ
+2 KBWF => 4 DQKLC
+2 LHWZQ => 2 PRMJ
+2 DLZS, 2 VCFX, 15 PDTP, 14 ZDWX, 35 NBZC, 20 JVMF, 1 BGWMS => 3 DWRH
+2 TKVCX, 6 RPLCK, 2 HTZW => 4 XTCP
+8 CNLFV, 1 NRSD, 1 VFTG => 9 VFZX
+1 TLRST => 4 WDKW
+9 VFCZG => 7 GJHX
+4 FZDP => 8 JLVQ
+2 ZMFXQ, 2 STHQ => 6 QDZB
+2 SJQL, 8 ZDWX, 6 LPRL, 6 WXDVT, 1 TPRT, 1 JNWJ => 8 KLJMS
+6 JBPHS, 2 ZBLC => 6 HTZW
+1 PDTP, 2 LHWZQ => 8 JNWJ
+8 ZBLC => 7 TKVCX
+2 WDKW, 31 QDZB => 4 PCSM
+15 GJHX, 5 TKVCX => 7 FZDP
+15 SJQL, 3 PRMJ => 4 JCVP
+31 CNLFV => 1 TGCW
+1 TLRST, 2 WDKW => 9 KBWF
+102 ORE => 7 VNMV
+103 ORE => 5 CNLFV
+163 ORE => 2 VFTG
+5 NRSD, 1 STHQ => 3 VFCZG
+16 LPVWN, 13 KBWF => 2 BGWMS
+5 BGWMS, 11 SJQL, 9 FZDP => 6 NBZC
+175 ORE => 7 NRSD
+5 HTZW => 4 LPVWN
+4 PRMJ => 7 JVMF
+6 PCSM, 8 DQKLC => 7 LPRL
+2 CNLFV => 7 TKRT
+3 FZDP => 3 LWNKB
+1 HTZW => 4 RPLCK