Javascript实现的常用算法(如冒泡、快速、鸽巢、奇偶等)
Javascript实现的常用算法(如冒泡、快速、鸽巢、奇偶等)
发布时间:2016-12-30 来源:查字典编辑
摘要:复制代码代码如下:l=[6,2,4,1,98,34,5,9,23,8,10,32]//冒泡排序/*functionbubbleSort(ar...

复制代码 代码如下:

l = [6, 2, 4, 1, 98, 34, 5, 9, 23, 8, 10, 32]

//冒泡排序

/*function bubbleSort(arr) {

newarr = arr.slice()

if (newarr.length <= 2) return newarr

for (var i = 0; i < newarr.length - 1; i++) {

for (var j = 0; j < newarr.length - i - 1; j++) {

if (newarr[j] > newarr[j + 1]) {

newarr[j] = [newarr[j + 1], newarr[j + 1] = newarr[j]][0]

}

}

}

return newarr

}

console.log(l)

result = bubbleSort(l)

console.log(result)*/

//快速排序

/*function quickSort(arr) {

if (arr.length <= 1) return arr;

var left = [],

right = [],

middle = [];

var mid = arr[Math.floor(arr.length / 2)]

for (var i = 0; i < arr.length; i++) {

if (arr[i] < mid) {

left.push(arr[i]);

} else if (arr[i] > mid) {

right.push(arr[i]);

} else {

middle.push(mid);

}

}

return [].concat(quickSort(left), middle, quickSort(right))

}

var results = quickSort(l)

console.log(results)

*/

//选择排序

/*function selectSort(arr) {

var min = 9999,

minindex = 0;

var left = [],

right = arr.slice();

if (arr.length <= 1) return arr;

for (var i = 0; i < arr.length; i++) {

if (arr[i] <= min) {

min = arr[i];

minindex = i;

}

}

left.push(min);

right.splice(minindex, 1);

return [].concat(left, selectSort(right))

}

var results = selectSort(l)

console.log(results)*/

//插入排序

/*function insertSort(arr) {

var tmp;

for (var i = 1; i < arr.length; i++) {

tmp = arr[i];

for (var j = i; j > 0; j--) {

if (arr[j - 1] > tmp) {

arr[j] = arr[j - 1];

} else {

break;

}

}

arr[j] = tmp;

}

return arr;

}

var results = insertSort(l)

console.log(results)*/

//木桶排序

/*function bucketSort(arr){

var bucket = [];

var newarr = [];

for (var i = 0; i < arr.length; i++) {

bucket[arr[i]] = arr[i];

}

for (var i = 0; i < bucket.length; i++) {

if (bucket[i] !== undefined){

newarr.push(bucket[i])

}

}

return newarr;

}

var results = bucketSort(l)

console.log(results)*/

//鸽巢排序,非负整数

/*function pigeonholeSort(arr){

var tempArr = [];

for(var i=0,l=arr.length;i<l;i++){

tempArr[arr[i]] = (tempArr[arr[i]]+1)||1 ;

}

var result = [],count;

for(var k=0;k<tempArr.length;k++){

count = tempArr[k];

if(count){

for(var i=0;i<count;i++){

result.push(k);

}

}

}

return result;

}

var results = pigeonholeSort(l)

console.log(results)*/

//归并排序

/*function mergeSort(arr) {

if (arr.length <= 1) return arr;

var mid = Math.floor(arr.length / 2);

var left = MergeSort(arr.slice(0, mid));

var right = MergeSort(arr.slice(mid));

var result = [];

while (left.length && right.length) {

if (left[left.length - 1] <= right[0]) {

result = result.concat(left);

left = [];

} else if (right[right.length - 1] < left[0]) {

result = result.concat(right);

right = [];

} else {

if (right[0] < left[0]) {

result.push(right.shift());

} else {

result.push(left.shift());

}

}

}

result = result.concat(left, right);

return result;

}*/

/*function mergeSort(arr) {

var merge = function(left, right) {

var result = [];

while (left.length > 0 && right.length > 0) {

if (left[0] < right[0]) {

result.push(left.shift());

} else {

result.push(right.shift());

}

}

return result.concat(left).concat(right);

}

if (arr.length == 1) return arr;

var middle = Math.floor(arr.length / 2),

left = arr.slice(0, middle),

right = arr.slice(middle);

return merge(mergeSort(left), mergeSort(right));

}

var results = mergeSort(l)

console.log(results)

*/

//堆排序

/*function heapSort(arr) {

var findRoot = function(arr, p, length) {

p = p || 0;

length = length || arr.length;

var self = arguments.callee;

var l = p * 2 + 1;

var r = (p + 1) * 2;

var left, right;

if (l < length) left = self(arr, l, length);

if (r < length) right = self(arr, r, length);

if (left > arr[p]) arr[p] = [left, arr[l] = arr[p]][0];

if (right > arr[p]) arr[p] = [right, arr[r] = arr[p]][0];

return arr[p];

};

for (var i = arr.length; i > 0; i--) {

findRoot(arr, 0, i);

arr[i - 1] = [arr[0], arr[0] = arr[i - 1]][0];

}

return arr;

}

var results = heapSort(l)

console.log(results)*/

//奇偶排列

/*function oddEvenSort(arr) {

var swaped = true,

k = 0;

while (swaped) {

if (k > 0) swaped = false;

for (var i = k; i < arr.length - 1; i += 2) {

if (arr[i]>arr[i+1]) {

arr[i] = [ arr[i+1], arr[i+1]=arr[i] ][0];

swaped = true;

}

}

k = [1, 0][k]

}

return arr;

}

var results = oddEvenSort(l)

console.log(results)*/

function oddEvenSort(arr) {

var swaped = true;

while (swaped) {

swaped = false;

for (var i = 0; i < arr.length; i += 2) {

if (arr[i] > arr[i + 1]) {

arr[i] = [arr[i + 1], arr[i + 1] = arr[i]][0];

swaped = true;

}

}

for (var i = 1; i < arr.length; i += 2) {

if (arr[i] > arr[i + 1]) {

arr[i] = [arr[i + 1], arr[i + 1] = arr[i]][0];

swaped = true;

}

}

}

return arr;

}

var results = oddEvenSort(l)

console.log(results)

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