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const std = @import("std");
const problem = struct {n: std.ArrayList(u64), mult: bool};
pub fn op(alloc: std.mem.Allocator, list: *std.ArrayList(problem), chunk: usize, count: u64, slice: []u8) !void {
if(slice[0] == '+' or slice[0] == '*'){
list.items[chunk].mult = slice[0] == '*';
} else {
const n: u64 = try std.fmt.parseInt(u64, slice, 10);
if(count == 0) {
var l = std.ArrayList(u64).init(alloc);
try l.append(n);
try list.append(problem{.n = l, .mult = false});
}
else try list.items[chunk].n.append(n);
}
}
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const alloc = gpa.allocator();
const path = "input.txt";
const fp = try std.fs.cwd().openFile(path, .{.mode = std.fs.File.OpenMode.read_only});
defer fp.close();
var reader = fp.reader();
var buffer: [8000]u8 = undefined;
var list = std.ArrayList(problem).init(alloc);
defer list.deinit();
defer for(list.items) |v| v.n.deinit();
var count: u64 = 0;
while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| : (count += 1) {
var i: usize = 0;
var chunk: usize = 0;
while(i < line.len){
while(i < line.len and line[i] == ' ') : (i += 1){}
if(std.mem.indexOf(u8, line[i..], " ")) |ind| {
try op(alloc, &list, chunk, count, line[i..i + ind]);
i = i + ind;
chunk += 1;
} else {
if(line[i..].len != 0){
try op(alloc, &list, chunk, count, line[i..]);
}
break;
}
}
}
var total: u64 = 0;
for(list.items) |v| {
var n: u64 = 0;
if(v.mult){
n = 1;
for(v.n.items) |a| n *= a;
} else {
for(v.n.items) |a| n += a;
}
total += n;
}
std.debug.print("{d}\n", .{total});
}
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