Khi \u0111\u00e1nh d\u00e0n \u0111\u1ec1 56, c\u00e1c tay ch\u01a1i l\u00e3o luy\u1ec7n th\u01b0\u1eddng truy\u1ec1n nhau kinh nghi\u1ec7m ch\u01a1i d\u00e0n 56 b\u1ecf k\u00e9p, b\u1ecf ch\u1ea1m 0 v\u00e0 1. Gi\u1ea3i th\u00edch r\u00f5 h\u01a1n cho nh\u1eefng anh em ch\u01b0a bi\u1ebft:<\/p>\n
Ch\u1ea1m 0 trong \u0111\u1ec1 d\u00e0n bao g\u1ed3m nh\u1eefng s\u1ed1 xu\u1ea5t hi\u1ec7n 0: 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 90, 80, 70, 60, 50, 40, 30, 20, 10.<\/p>\n
Ch\u1ea1m 1 bao g\u1ed3m nh\u1eefng s\u1ed1 xu\u1ea5t hi\u1ec7n 1: 10,11,12,13,14,15,16,17,18,19,91,81,71,61,51,41,31,21,01<\/p>\n
B\u1ed9 k\u00e9p bao g\u1ed3m nh\u1eefng c\u1eb7p s\u1ed1 gi\u1ed1ng nhau: 00,11,22,33,44,55,66,77,88,99<\/p>\n
B\u1ecf h\u1ebft nh\u1eefng s\u1ed1 trong ch\u1ea1m 0, ch\u1ea1m 1 v\u00e0 b\u1ed9 k\u00e9p ta s\u1ebd c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c 56 s\u1ed1 sau: 23, 24, 25, 26, 27, 28, 29, 32, 34, 35, 36, 37, 38, 39, 42, 43, 45, 46, 47, 48, 49, 52, 53, 54, 56, 57, 58, 59, 62, 63, 64, 65, 67, 68, 69, 72, 73, 74, 75, 76, 78, 79, 82, 83, 84, 85, 86, 87, 89, 92, 93, 94, 95, 96, 97, 98<\/p>\n
\u0110\u1ebfn khi c\u00e1c anh em th\u1ea5y \u0111\u1ec1 c\u00f3 d\u1ea5u hi\u1ec7u v\u1ec1 k\u00e9p b\u1eb1ng, l\u00fac n\u00e0y ng\u01b0\u1eddi ta s\u1ebd \u0111\u00e1nh g\u1ea5p th\u1ebfp theo khung cao nh\u1ea5t trong 3 ng\u00e0y. G\u1ea5p th\u1ebfp ngh\u0129a l\u00e0 sau m\u1ed9t ng\u00e0y kh\u00f4ng tr\u00fang s\u1ebd \u0111\u00e1nh g\u1ea5p \u0111\u00f4i v\u00e0o ng\u00e0y ti\u1ebfp theo.<\/p>\n