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-rw-r--r--18/a.lua55
-rw-r--r--18/b.lua62
-rw-r--r--18/input.txt376
3 files changed, 493 insertions, 0 deletions
diff --git a/18/a.lua b/18/a.lua
new file mode 100644
index 0000000..b9dd2d1
--- /dev/null
+++ b/18/a.lua
@@ -0,0 +1,55 @@
+input = io.lines('input.txt')
+
+function is_op(token)
+ return token == '+' or token == '*'
+end
+
+function f_op(op)
+ if op == '+' then
+ return function (a, b) return a + b end
+ else
+ return function (a, b) return a * b end
+ end
+end
+
+function is_digit(token)
+ return token >= '1' and token <= '9'
+end
+
+function do_math(expression)
+ stack = {}
+ for i = 1, #expression do
+ token = expression:sub(i, i)
+ if is_op(token) then
+ table.insert(stack, token)
+ elseif is_digit(token) then
+ if is_op(stack[#stack]) then
+ op = table.remove(stack)
+ n = table.remove(stack)
+ table.insert(stack, f_op(op)(n, tonumber(token)))
+ else
+ table.insert(stack, tonumber(token))
+ end
+ elseif token == '(' then
+ table.insert(stack, token)
+ elseif token == ')' then
+ res = table.remove(stack)
+ table.remove(stack)
+ if is_op(stack[#stack]) then
+ op = table.remove(stack)
+ n = table.remove(stack)
+ table.insert(stack, f_op(op)(n, res))
+ else
+ table.insert(stack, res)
+ end
+ end
+ end
+ return stack[1]
+end
+
+sum = 0
+for line in input do
+ sum = sum + do_math(line)
+end
+
+print(sum)
diff --git a/18/b.lua b/18/b.lua
new file mode 100644
index 0000000..ab1c769
--- /dev/null
+++ b/18/b.lua
@@ -0,0 +1,62 @@
+input = io.lines('input.txt')
+
+function is_op(token)
+ return token == '+' or token == '*'
+end
+
+function f_op(op)
+ if op == '+' then
+ return function (a, b) return a + b end
+ else
+ return function (a, b) return a * b end
+ end
+end
+
+function is_digit(token)
+ return token >= '1' and token <= '9'
+end
+
+function do_math(expression)
+ stack = {}
+ for i = 1, #expression do
+ token = expression:sub(i, i)
+ if is_op(token) then
+ table.insert(stack, token)
+ elseif is_digit(token) then
+ if stack[#stack] == '+' then
+ op = table.remove(stack)
+ n = table.remove(stack)
+ table.insert(stack, f_op(op)(n, tonumber(token)))
+ else
+ table.insert(stack, tonumber(token))
+ end
+ elseif token == '(' then
+ table.insert(stack, token)
+ elseif token == ')' then
+ res = table.remove(stack)
+ last_token = table.remove(stack)
+ if last_token == '*' then
+ while not (last_token == '(') do
+ res = res * table.remove(stack)
+ last_token = table.remove(stack)
+ end
+ end
+
+ if stack[#stack] == '+' then
+ table.remove(stack)
+ n = table.remove(stack)
+ table.insert(stack, res + n)
+ else
+ table.insert(stack, res)
+ end
+ end
+ end
+ return stack[1]
+end
+
+sum = 0
+for line in input do
+ sum = sum + do_math('(' .. line .. ')')
+end
+
+print(sum)
diff --git a/18/input.txt b/18/input.txt
new file mode 100644
index 0000000..9b9ba4f
--- /dev/null
+++ b/18/input.txt
@@ -0,0 +1,376 @@
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