Created
October 21, 2017 12:30
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Array.prototype.swap = function(x,y) { | |
if(this[x] == undefined || this[y] == undefined) return; | |
var temp = this[x]; | |
this[x] = this[y]; | |
this[y] = temp; | |
}; | |
var MaxHeapify = function(A,i) { | |
var l = 2*i; | |
var r = 2*i +1; | |
var largest = i; | |
if(l <= heap_size && A[l] > A[largest]) { | |
largest = l; | |
} | |
if(r <= heap_size && A[r] > A[largest]) { | |
largest = r; | |
} | |
if (largest != i) { | |
A.swap(i,largest); | |
MaxHeapify(A,largest); | |
} | |
}; | |
var BuildMaxHeap = function(A) { | |
var middle = Math.floor(A.length / 2); | |
for(var i=middle; i>=1;i--) { | |
MaxHeapify(A,i); | |
} | |
}; | |
var HeapSort = function(A) { | |
BuildMaxHeap(A); | |
for(var i=A.length;i>=2;i--) { | |
A.swap(1,i); | |
heap_size--; | |
MaxHeapify(A,1); | |
} | |
}; | |
var arr = [null,4,8,1,3,2,15,9,10,14,8,7]; | |
var heap_size = arr.length; | |
HeapSort(arr); | |
console.log(arr); |
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