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var sequentialDigits = function (low, high) { let init = '123456789', len = low.toString().length, initI = low.toString().slice(0, 1); i = init.substr(initI - 1, len) >= low ? initI - 1...
```JavaScript let res = []; let arr = []; const findId = (data, id) => { data.forEach((item, index) => { if (item.children) { if (item.id !== id) { res.push(item.id); findId(item.children,...