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const std = @import("std");
const print = std.debug.print;
pub fn solve(part: []u8, reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
if (std.mem.eql(u8, part, "1")) {
try part1(reader, allocator);
} else {
try part2(reader, allocator);
}
}
fn part1(reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
var output: usize = 0;
var problems = try std.ArrayList(std.ArrayList(usize)).initCapacity(allocator, 0);
defer problems.deinit(allocator);
while (reader.takeDelimiter('\n')) |line| {
if (line == null) {
break;
}
var split = std.mem.splitScalar(u8, line.?, ' ');
var n: usize = 0;
while(split.next()) |part| {
if (part.len > 0){
if (part[0] == '+') {
for(problems.items[n].items) |number| {
output += number;
}
problems.items[n].deinit(allocator);
} else if (part[0] == '*') {
var tmp: usize = 1;
for(problems.items[n].items) |number| {
tmp *= number;
}
output += tmp;
problems.items[n].deinit(allocator);
} else {
const number = try std.fmt.parseInt(usize, part, 10);
if (n >= problems.items.len) {
try problems.append(allocator, try std.ArrayList(usize).initCapacity(allocator, 0));
}
try problems.items[n].append(allocator, number);
}
n += 1;
}
}
} else |_| {}
print("{d}\n", .{output});
}
fn part2(reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
var output: usize = 0;
var problems = try std.ArrayList([]u8).initCapacity(allocator, 0);
defer problems.deinit(allocator);
while (reader.takeDelimiter('\n')) |line| {
if (line == null) {
break;
}
try problems.append(allocator, line.?);
} else |_| {}
var n: usize = 0;
var accum: usize = 1;
var operator = problems.items[problems.items.len - 1][0];
while(n < problems.items[0].len) {
var number: usize = 0;
for (0..problems.items.len - 1) |i| {
if (problems.items[i][n] != ' ') {
number *= 10;
number += problems.items[i][n] - '0';
}
}
n += 1;
if (number == 0) {
if (operator == '*') {
output += accum;
}
operator = problems.items[problems.items.len - 1][n];
accum = 1;
} else if (operator == '+') {
output += number;
} else {
accum *= number;
}
}
print("{d}\n", .{output});
}
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