1.希尔排序
function shellSort(arr) {
let length = arr.length;
for (let step = length >> 1; step > 0; step = step >> 1) { // step = step >>1 等同于 step = Math.floor(step)
for (let i = step; i < length; i++) {
for (let j = i; j >= step && arr[j] < arr[j - step]; j -= step) {
[arr[j - step], arr[j]] = [arr[j], arr[j - step]];
};
};
};
return arr;
};
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