Nhi\u1ec1u ng\u01b0\u1eddi m\u1edbi tham gia ch\u01a1i x\u1ed5 s\u1ed1 th\u01b0\u1eddng ch\u01b0a hi\u1ec3u r\u00f5 v\u1ec1 lu\u1eadt ch\u01a1i, c\u0169ng nh\u01b0 c\u00e1ch t\u00ednh gi\u1ea3i trong x\u1ed5 s\u1ed1. H\u1ecd th\u01b0\u1eddng h\u1ecfi nh\u1eefng c\u00e2u h\u1ecfi v\u1ec1 c\u00e1ch t\u00ednh l\u00f4 c\u0169ng nh\u01b0 vi\u1ec7c s\u1ed1 \u0111\u1ea7u s\u1ed1 \u0111u\u00f4i trong x\u1ed5 s\u1ed1 c\u00f3 \u00fd ngh\u0129a nh\u01b0 th\u1ebf n\u00e0o. \u0110\u1ec3 gi\u00fap b\u1ea1n \u0111\u1ecdc hi\u1ec3u h\u01a1n v\u1ec1 x\u1ed5 s\u1ed1, h\u00e3y c\u00f9ng ch\u00fang t\u00f4i t\u00ecm hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 \u0111\u1ea7u \u0111u\u00f4i x\u1ed5 s\u1ed1 l\u00e0 g\u00ec nh\u00e9!<\/span><\/p>\n \u0110\u1ed1i v\u1edbi x\u1ed5 s\u1ed1 \u1edf m\u1ed7i mi\u1ec1n l\u1ea1i s\u1ebd c\u00f3 c\u00e1ch t\u00ednh \u0111\u1ea7u \u0111u\u00f4i l\u00f4 \u0111\u1ec1 kh\u00e1c nhau. Tuy nhi\u00ean chung quy l\u1ea1i, x\u1ed5 s\u1ed1 \u1edf mi\u1ec1n Nam hay mi\u1ec1n B\u1eafc \u0111\u1ec1u c\u00f3 c\u00e1ch ch\u01a1i v\u00e0 tr\u00fang t\u01b0\u01a1ng t\u01b0\u01a1ng nh\u01b0 nhau. \u0110\u1ed1i v\u1edbi c\u00e1ch ch\u01a1i x\u1ed5 s\u1ed1 truy\u1ec1n th\u1ed1ng, ng\u01b0\u1eddi ch\u01a1i c\u1ea7n l\u01b0u \u00fd hai con s\u1ed1 n\u1eb1m \u1edf v\u1ecb tr\u00ed cu\u1ed1i trong gi\u1ea3i \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ea7u \u0111u\u00f4i. <\/span><\/p>\n V\u00ed d\u1ee5 nh\u01b0, gi\u1ea3i \u0111\u1eb7c bi\u1ec7t x\u1ed5 s\u1ed1 chi\u1ec1u h\u00f4m nay ra 21457 trong \u0111\u00f3 con s\u1ed1 5 s\u1ebd \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ed1 \u0111\u1ea7u v\u00e0 con s\u1ed1 7 s\u1ebd \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ed1 \u0111u\u00f4i. \u0110\u1ed1i v\u1edbi c\u00e1ch ch\u01a1i truy\u1ec1n th\u00f4ng m\u00e0 nhi\u1ec1u \u0111\u1ecba ph\u01b0\u01a1ng v\u1eabn \u0111ang s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u01a1i \u0111\u1ea7u \u0111u\u00f4i \u0111\u01b0\u1ee3c t\u00ednh nh\u01b0 sau. <\/span><\/p>\n V\u1eabn l\u00e0 v\u00ed d\u1ee5 gi\u1ea3i \u0111\u1eb7c bi\u1ec7t l\u00e0 s\u1ed1 21457, n\u1ebfu nh\u01b0 h\u00f4m \u0111\u00f3 b\u1ea1n \u0111\u00e1nh s\u1ed1 5 l\u00e0 b\u1ea1n tr\u00fang s\u1ed1 \u0111\u1ea7u, \u0111\u00e1nh s\u1ed1 7 l\u00e0 tr\u00fang s\u1ed1 \u0111u\u1ed5i( s\u1ed1 \u0111\u00edt).<\/span><\/p>\n M\u1ed9t s\u1ed1 n\u01a1i l\u1ea1i g\u1ecdi c\u00e1ch ch\u01a1i \u0111\u1ea7u \u0111u\u1ed5i theo m\u1ed9t h\u01b0\u1edbng kh\u00e1c. Ta c\u00f3 th\u1ec3 g\u1ecdi c\u00e1ch ch\u01a1i \u0111\u1ea7u \u0111u\u00f4i \u1ea5y theo ki\u1ec3u A-B. V\u00ed d\u1ee5 c\u1ee7a c\u00e1ch ch\u01a1i n\u00e0y r\u1ea5t \u0111\u01a1n gi\u1ea3n nh\u01b0 sau:<\/span><\/p>\n <\/p>\n N\u1ebfu h\u00f4m tr\u01b0\u1edbc b\u1ea1n \u0111\u00e1nh c\u00e1c c\u1eb7p s\u1ed1 56,65, 17, 97,82,28.35,65 v\u00e0 k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1 h\u00f4m \u1ea5y l\u00e0 56344 th\u00ec c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n \u0111\u00e3 tr\u00fang s\u1ed1 \u0111\u1ea7u 56. \u0110\u00e1nh \u0111\u1ea7u A th\u00ec b\u1ea1n ch\u1ec9 c\u1ea7n so 2 con s\u1ed1 \u1edf v\u1ecb tr\u00ed s\u1ed1 1 v\u00e0 s\u1ed1 2 \u1edf gi\u1ea3i \u0111\u1eb7c bi\u1ec7t th\u00f4i. <\/span><\/p>\n T\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u1eady n\u1ebfu \u0111\u00e1nh \u0111\u1ea7u B th\u00ec b\u1ea1n ch\u1ec9 c\u1ea7n so 2 con s\u1ed1 \u1edf v\u1ecb tr\u00ed 4 v\u00e0 5 c\u1ee7a gi\u1ea3i \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 bi\u1ebft m\u00ecnh c\u00f3 tr\u00fang gi\u1ea3i hay kh\u00f4ng. Theo m\u1ed9t c\u00f4ng th\u1ee9c nh\u1ea5t \u0111\u1ecbnh ta c\u00f3 th\u1ec3 hi\u1ec3u nh\u01b0 sau: <\/span><\/p>\n \u2013<\/b>\u0110\u1ea7u s\u1ed1 0: s\u1ed1 00, s\u1ed1 01, s\u1ed1 02, s\u1ed1 03, s\u1ed1 04, s\u1ed1 05, s\u1ed1 06, s\u1ed1 07, s\u1ed1 08, s\u1ed1 09<\/span><\/p>\n \u2013 \u0110\u1ea7u s\u1ed1 1: S\u1ed1 10, s\u1ed1 11, s\u1ed1 12, s\u1ed1 13, s\u1ed1 14, s\u1ed1 15, s\u1ed1 16, s\u1ed1 17, s\u1ed1 18, s\u1ed1 19<\/span><\/p>\n -\u0110\u1ea7u s\u1ed1 2: S\u1ed1 21, s\u1ed1 21, s\u1ed1 23, s\u1ed1 24, s\u1ed1 25, s\u1ed1 26, s\u1ed1 27, s\u1ed1 28, s\u1ed1 29<\/span><\/p>\n -\u0110\u1ea7u s\u1ed1 3: s\u1ed1 31, s\u1ed1 32, s\u1ed1 33, s\u1ed1 34, s\u1ed1 35, s\u1ed1 36, s\u1ed1 37, s\u1ed1 38, s\u1ed1 39<\/span><\/p>\n \u2013 \u0110\u1ea7u s\u1ed1 4: s\u1ed1 41, s\u1ed1 42, s\u1ed1 43, s\u1ed1 44, s\u1ed1 45, s\u1ed1 46, s\u1ed1 47, s\u1ed1 48, s\u1ed1 49<\/span><\/p>\n \u2013 \u0111\u1ea7u s\u1ed1 5: s\u1ed1 51, s\u1ed1 52, s\u1ed1 53, s\u1ed1 54, s\u1ed1 55, s\u1ed1 56, s\u1ed1 57, s\u1ed1 58, s\u1ed1 59<\/span><\/p>\n \u2013 \u0111\u1ea7u s\u1ed1 6: S\u1ed1 61, s\u1ed1 62, s\u1ed1 63, s\u1ed1 64, s\u1ed1 65, s\u1ed1 66, s\u1ed1 67, s\u1ed1 68, s\u1ed1 69<\/span><\/p>\n \u2013 \u0111\u1ea7u s\u1ed1 7: S\u1ed1 71, s\u1ed1 72, s\u1ed1 73, s\u1ed1 74, s\u1ed1 75, s\u1ed1 76, s\u1ed1 77, s\u1ed1 78, s\u1ed1 79<\/span><\/p>\n \u2013 \u0110\u1ea7u s\u1ed1 8: S\u1ed1 81, s\u1ed1 82, s\u1ed1 83, s\u1ed1 84, s\u1ed1 85, s\u1ed1 86, s\u1ed1 87, s\u1ed1 88, s\u1ed1 89<\/span><\/p>\n \u2013 \u0111\u1ea7u s\u1ed1 9: s\u1ed1 91, s\u1ed1 92, s\u1ed1 93, s\u1ed1 94, s\u1ed1 95, s\u1ed1 96, s\u1ed1 97, s\u1ed1 98, s\u1ed1 99<\/span><\/p>\nNh\u01b0 th\u1ebf n\u00e0o \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u1ea7u \u0111u\u00f4i x\u1ed5 s\u1ed1 theo ki\u1ec3u truy\u1ec1n th\u1ed1ng<\/b><\/span><\/h2>\n
D\u00f2 \u0111\u1ea7u \u0111u\u00f4i c\u1ee7a x\u1ed5 s\u1ed1 theo ki\u1ec3u \u0111\u00e1nh A-B<\/b><\/span><\/h2>\n
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C\u00e1c c\u1eb7p s\u1ed1 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo \u0111\u1ea7u c\u00e1c l\u00f4 \u0111\u1ec1<\/b><\/span><\/h2>\n
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