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                >[danger]字符串構造,每個小寫字母都要出現至少兩次,而且相同字母的最小距離剛好是k。 ~~~ const fun = function (k) { const arr = [ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x' ] let pos = 0 let str = '' while (pos < 26) { const temp = arr.slice(pos, pos + k).join("") str += temp + temp pos += k } console.log(str) } fun(1) fun(2) fun(3) fun(4) ~~~
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