Selection Sort Algorithm in Data Structure

• In this algorithm, elements of an Array list[N] are sorted into an ascending order.
• Two variables SMALL and POS have been used to locate the smallest element in the unsorted part of the array LIST.
• Temp is variable used to interchange the selected element with the first element of the unsorted part of the array LIST.

Steps of Selection Sort Algorithm

1•   for i=1 to N-1 repeat steps 2 to 7
2•   SMALL= LIST[i]; POS=i 
3•   for j=i+1 to N repeat step 4
4•   if(LIST[J]>SMALL) then
{ 
     SMALL =LIST[j]
     POS=j
{ 
end of loop j
}
5•  TEMP= LIST[i]; 
6•  LSIT[i]=LIST[Pos] 
7•  LIST[POS]=TEMP 
   { 
    End of loop i  
   } 
8•  End 

• In this we took two loops, the outer loop i and inner loop j.
• The number of comparisons needed for N element is N-1, so outer loop i terminates at N-1 and inner j loop always start from i+1th location record comparison has to start from second element of uncertain part of the array LIST.
• In this interchange will take place outside the body of loop j i.e from step 5 to 7.
explaination of selection sort

17- Array- Selection Sort Part-2- DataStructure Tutorials




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