// 快速排序
function quickSort(arr) {
if (arr.length <= 1) {
return arr;
}
const pivot = arr[0];
const left = [];
const right = [];
for (let i = 1; i < arr.length; i++) {
if (arr[i] < pivot) {
left.push(arr[i]);
} else {
right.push(arr[i]);
}
}
return quickSort(left).concat(pivot, quickSort(right));
}
console.time('quickSort');
console.log(quickSort([0, 1, 0, 2, 0, 2, 1, 0, 1]));
console.timeEnd('quickSort');
/*
三路排序演算法
*/
function threeWaySort(arr) {
let zero = 0,
two = arr.length - 1;
for (let i = 0; i < arr.length; i++) {
while (arr[i] === 2 && i < two) {
[arr[i], arr[two]] = [arr[two], arr[i]];
two--;
}
if (arr[i] === 0) {
[arr[i], arr[zero]] = [arr[zero], arr[i]];
zero++;
}
}
return arr;
}
console.time('threeWaySort');
console.log(threeWaySort([0, 1, 0, 2, 0, 2, 1, 0, 1]));
console.timeEnd('threeWaySort');