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use fmt;
use io;
use math;
use os;
use strconv;
use strings;
fn digits(num: u64) u64 = {
return math::ceilf64(math::log10f64(num: f64)): u64;
};
export fn main() void = {
let handle = os::open("input.txt")!;
defer io::close(handle)!;
let buf = io::drain(handle) as []u8;
defer free(buf);
let input = strings::fromutf8_unsafe(buf);
let range_strings = strings::split(input, ",")!;
let answer: u64 = 0;
for (let i: size = 0; i < len(range_strings); i += 1) {
let range_ends = strings::cut(strings::rtrim(range_strings[i], '\n'), "-");
let start = strconv::stou64(range_ends.0)!;
let end = strconv::stou64(range_ends.1)!;
let start_digits = digits(start);
let end_digits = digits(end);
if (start_digits % 2 != 0 && end_digits % 2 != 0 && start_digits == end_digits) {
continue;
};
for (let j = start; j <= end; j += 1) {
let digits = digits(j);
if (digits % 2 == 0) {
let num_str = strconv::u64tos(j);
let first_half = strings::sub(num_str, 0, len(num_str) / 2);
let second_half = strings::sub(num_str, len(num_str) / 2, len(num_str));
if (first_half == second_half) {
answer += j;
};
};
};
};
fmt::printfln("Answer: {}", answer)!;
};
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