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Mergesort

Mergesort. Mergesort: Algorithm. void mergesort( Elem[] a, Elem[] temp, int Ieft, int right ) { int I, j, k, mid = (left+right)/2 if( left == right ) return mergesort( a, temp, left, mid); mergesort( a, temp, mid+1, right); // do the merge operation

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Mergesort

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  1. Mergesort

  2. Mergesort: Algorithm void mergesort( Elem[] a, Elem[] temp, int Ieft, int right ) { int I, j, k, mid = (left+right)/2 if( left == right ) return mergesort( a, temp, left, mid); mergesort( a, temp, mid+1, right); // do the merge operation for( i = left; i <= mid; i++ ) temp[i] = a[i] for( j = 1; j <= right-mid; j++ ) temp[ right-j+1 ] = a[ j+mid ] // merge sublists back to array for( i=left, j=right, k=left; k<=right; k++ ) { if( temp[ i ] < temp[ j ] ) a[k] = temp[ i++ ] else a[k]=temp[ j-- ] } }

  3. Mergesort: Illustration 85 24 63 45 17 31 96 50

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