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| 1 | local dictionary = {}
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| 2 | ||
| 3 | local function insertWord(dict, word) | |
| 4 | local head, tail = word:upper():match('^(%a)(%a*)$')
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| 5 | if not head then return false; end | |
| 6 | if not dict[head] then dict[head] = {}; end
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| 7 | if tail == '' then | |
| 8 | dict[head][''] = true | |
| 9 | return true | |
| 10 | else | |
| 11 | return insertWord(dict[head], tail) | |
| 12 | end | |
| 13 | end | |
| 14 | ||
| 15 | local function confirmWord(dict, word) | |
| 16 | local head, tail = word:upper():match('^(%a)(%a*)$')
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| 17 | if not head then return false; end | |
| 18 | if dict[head] then | |
| 19 | else | |
| 20 | return false | |
| 21 | end | |
| 22 | end | |
| 23 | ||
| 24 | insertWord(dictionary, 'BAG') | |
| 25 | ||
| 26 | print(confirmWord(dictionary, 'BAG')) |
