const std = @import("std");

const mem = std.mem;
const fmt = std.fmt;

const input = @embedFile("input");

pub fn main() !void {
    input: for (input) |_, i| {
        // Start searching at fourth character
        if (i < 3) continue;
        if (i > input.len - 3) break;

        const chars: []const u8 = input[i-3..i+1];

        std.debug.print("{s}\n", .{chars});

        chars: for (chars) |char_1, j| {
            for (chars) |char_2, k| {
                // Don't check the same character, or the ones that we already checked
                if (j <= k) continue;
                //std.debug.print("{c},{c}\n", .{char_1, char_2});
                if (char_1 == char_2) {
                    // Don't check anymore
                    break :chars;
                }
            }
        } else {
            // If no repeats have been found
            // i is the current character index in the input (i+1 if we count from 1)
            std.debug.print("Solution found: {}\n", .{i+1});
            break :input;
        }
    }
}