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const std = @import("std");
pub fn repeats(num: u64) !bool {
var buf: [20]u8 = undefined;
const str = try std.fmt.bufPrint(&buf, "{}", .{num});
if(@mod(str.len, 2) == 1) return false;
for(0..str.len/2) |find| {
const bind = find + str.len/2;
if(str[find] != str[bind]) return false;
//std.debug.print("{} {c}, {} {c}\n", .{find, str[find], bind, str[bind]});
}
return true;
}
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: [256]u8 = undefined;
var total: u64 = 0;
while(try reader.readUntilDelimiterOrEof(&buffer, ',')) |l| {
var line = l;
if(line[line.len - 1] == '\n') {
line = line[0 .. line.len - 1];
}
if(std.mem.indexOf(u8, line, "-")) |ind| {
const start = try std.fmt.parseInt(u64, line[0 .. ind], 10);
const end = try std.fmt.parseInt(u64, line[ind + 1 ..], 10);
//std.debug.print("{d} - {d}\n", .{start, end});
for(start .. end + 1) |n| {
if(try repeats(n)){
total += n;
//std.debug.print("{}\n", .{n});
}
}
}
}
std.debug.print("{d}\n", .{total});
}
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