diff options
| -rw-r--r-- | 18/a.lua | 55 | ||||
| -rw-r--r-- | 18/b.lua | 62 | ||||
| -rw-r--r-- | 18/input.txt | 376 |
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 @@ +2 + (2 + 6 * (4 * 5 * 8 * 7) + 3) * (9 + (4 * 3 * 7 * 9)) * 7 +7 * ((9 + 3 + 2 * 8 + 8 + 6) * 5 * 7 * 4 * 9 * 4) + (2 + 9 * (7 * 8 * 2 + 9 + 7) + 8 + (4 + 9 * 7) * 3) * 4 + 9 * (4 * 8 * 4) +9 * 2 + (9 * 7 * 4 + 4 * 6 + (8 + 9 + 3 * 3)) +(2 * (2 + 4 * 7 + 8) * 5 * 7) * 6 + 4 + 4 +9 + 7 * (2 * (3 * 3 + 9 + 8 * 4) + 8 * 9) * 6 * 9 + 8 +7 + (9 + 4 * 5 * 4 + 6 + (8 + 7 + 4 + 7 + 6)) + (3 * 7 * 8 * 2) * 3 * 3 + 5 +7 * 2 + (2 + 5 + 4 * 5) + (4 * 2 * 5 * (5 * 2 * 6 * 9)) * (7 + 6 + 5 + (4 * 2 + 4 + 6 + 6) + 9 + 2) +((4 * 4 + 4) + 3 * 2) * 3 * 8 + 7 + 8 + 6 +(4 + 8 + 5 + 3 + (8 + 8 + 4)) * 5 + 5 * (9 * 8 * 2 + (4 * 3)) + 7 +2 * 7 + 8 * 3 + 8 +8 + 7 * ((4 + 4 + 3 * 8 + 3) * 7 * 6 * 6 * 2) +4 + 2 + (6 * 4) * 5 + 7 * 9 +8 * 6 + 9 * (8 + 4) + 3 +9 + 2 + 2 + ((4 + 4 * 8 + 6 * 6 * 5) * 8 * 2) * 9 * (6 + 3) +(2 * 7 + 7 + 9 + 3) * (3 + 8 + 7) + 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