|
| 1 | +tracer._print('original array = ['+D.join(', ')+']'); |
| 2 | +tracer._sleep(1000); |
| 3 | +tracer._pace(500); |
| 4 | + |
| 5 | +functionmergeSort(start,end){ |
| 6 | +if(Math.abs(end-start)<=1){ |
| 7 | +return[]; |
| 8 | +} |
| 9 | + |
| 10 | +varmiddle=Math.ceil((start+end)/2); |
| 11 | + |
| 12 | +mergeSort(start,middle); |
| 13 | +mergeSort(middle,end); |
| 14 | + |
| 15 | +tracer._print('divide left['+start+', '+(middle-1)+'], right['+(middle)+', '+(end-1)+']'); |
| 16 | + |
| 17 | +returnmergeSort.merge(start,middle,end); |
| 18 | +} |
| 19 | + |
| 20 | +mergeSort.merge=function(start,middle,end){ |
| 21 | +varleft=Array(); |
| 22 | +varright=Array(); |
| 23 | + |
| 24 | +varleftSize=middle-start; |
| 25 | +varrightSize=end-middle; |
| 26 | +varmaxSize=Math.max(leftSize,rightSize); |
| 27 | +varsize=end-start; |
| 28 | +vari; |
| 29 | + |
| 30 | +for(i=0;i<maxSize;i++){ |
| 31 | +if(i<leftSize){ |
| 32 | +left.push(D[start+i]); |
| 33 | +tracer._select(start+i); |
| 34 | +tracer._print('insert value into left array['+i+'] = '+D[start+i]); |
| 35 | +} |
| 36 | +if(i<rightSize){ |
| 37 | +right.push(D[middle+i]); |
| 38 | +tracer._select(middle+i); |
| 39 | +tracer._print('insert value into right array['+i+'] = '+D[middle+i]); |
| 40 | +} |
| 41 | +} |
| 42 | +tracer._print('left array = ['+left.join(', ')+'],'+'right array = ['+right.join(', ')+']'); |
| 43 | + |
| 44 | +i=0; |
| 45 | +while(i<size){ |
| 46 | +if(left[0]&&right[0]){ |
| 47 | +if(left[0]>right[0]){ |
| 48 | +D[start+i]=right.shift(); |
| 49 | +tracer._print('rewrite from right array['+i+'] = '+D[start+i]); |
| 50 | +}else{ |
| 51 | +D[start+i]=left.shift(); |
| 52 | +tracer._print('rewrite from left array['+i+'] = '+D[start+i]); |
| 53 | +} |
| 54 | +}elseif(left[0]){ |
| 55 | +D[start+i]=left.shift(); |
| 56 | +tracer._print('rewrite from left array['+i+'] = '+D[start+i]); |
| 57 | +}else{ |
| 58 | +D[start+i]=right.shift(); |
| 59 | +tracer._print('rewrite from right array['+i+'] = '+D[start+i]); |
| 60 | +} |
| 61 | + |
| 62 | +tracer._deselect(start+i); |
| 63 | +tracer._notify(start+i); |
| 64 | + |
| 65 | +i++; |
| 66 | +} |
| 67 | + |
| 68 | +tempArray=Array(); |
| 69 | +for(i=start;i<end;i++){ |
| 70 | +tempArray.push(D[i]); |
| 71 | +} |
| 72 | +tracer._print('merged array = ['+tempArray.join(', ')+']'); |
| 73 | +} |
| 74 | + |
| 75 | +mergeSort(0,D.length) |
| 76 | +tracer._print('sorted array = ['+D.join(', ')+']'); |