Created
November 25, 2019 08:16
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Heap data structure
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| var myHeap = []; | |
| function swap(i, j) { // swap; | |
| var temp; | |
| temp = myHeap[i]; | |
| myHeap[i] = myHeap[j]; | |
| myHeap[j] = temp; | |
| } | |
| function bubble(i) { | |
| var pi = Math.floor(i / 2); // parent's index | |
| if (myHeap[i] < myHeap[pi]) { | |
| swap(i, pi); | |
| bubble(pi); | |
| } | |
| } | |
| function bubble_down(i) { | |
| var ci = (myHeap[i * 2] < myHeap[i * 2 + 1]) ? i * 2 : i * 2 + 1; // child index | |
| if (myHeap[ci] < myHeap[i]) { | |
| swap(ci, i); | |
| bubble_down(ci) | |
| } | |
| } | |
| function addHeap(n) { | |
| myHeap.push(n); | |
| bubble(myHeap.length - 1); | |
| } | |
| function deleteFromHeap(n) { | |
| for (var i = 0; i < myHeap.length; i++) { | |
| if (myHeap[i] == n) { | |
| myHeap[i] = myHeap[myHeap.length - 1]; | |
| myHeap.pop(); | |
| bubble_down(i); | |
| return; | |
| } | |
| } | |
| } | |
| function getMin() { | |
| var min = myHeap[0]; | |
| myHeap[0] = myHeap[myHeap.length - 1]; | |
| bubble_down(0); | |
| return min; | |
| } | |
| function peakMin() { | |
| return myHeap[0]; | |
| } | |
| var arr = [3, 0, 2, 5, 9, 4, 1]; | |
| addHeap(3); | |
| addHeap(0); | |
| addHeap(2); | |
| addHeap(5); | |
| addHeap(9); | |
| addHeap(4); | |
| addHeap(1); | |
| deleteFromHeap(0); | |
| deleteFromHeap(1); | |
| console.log(myHeap) | |
| console.log(getMin()); |
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