Commit bc13c33

committed

Added code

1 parent 253a2dd commit bc13c33Copy full SHA for bc13c33

File tree

+47

-0

lines changed

+47

-0

lines changed

Lines changed: 47 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,47 @@`
	`1`	`+def inversion_count(arr,s,e):`
	`2`	`+`
	`3`	`+ if(s>=e):`
	`4`	`+ return 0`
	`5`	`+`
	`6`	`+ mid = (s+e)//2`
	`7`	`+ x = inversion_count(arr,s,mid)`
	`8`	`+ y = inversion_count(arr,mid+1,e)`
	`9`	`+ z = merge(arr,s,e)`
	`10`	`+`
	`11`	`+ return x+y+z`
	`12`	`+`
	`13`	`+def merge(arr,s,e):`
	`14`	`+`
	`15`	`+ mid = (s+e)//2`
	`16`	`+`
	`17`	`+ i = s`
	`18`	`+ j = mid+1`
	`19`	`+ karr = []`
	`20`	`+ cnt = 0`
	`21`	`+`
	`22`	`+ while i<=mid and j<=e:`
	`23`	`+`
	`24`	`+ if arr[i]<=arr[j]:`
	`25`	`+ karr.append(arr[i])`
	`26`	`+ i+=1`
	`27`	`+ else:`
	`28`	`+ karr.append(arr[j])`
	`29`	`+ cnt+=(mid-i+1)`
	`30`	`+ j+=1`
	`31`	`+`
	`32`	`+ while i<=mid:`
	`33`	`+ karr.append(arr[i])`
	`34`	`+ i+=1`
	`35`	`+`
	`36`	`+ while j<=e:`
	`37`	`+ karr.append(arr[i])`
	`38`	`+ j+=1`
	`39`	`+`
	`40`	`+ for i in range(s,e+1):`
	`41`	`+ arr[i] = karr[i-s]`
	`42`	`+`
	`43`	`+ return cnt`
	`44`	`+`
	`45`	`+`
	`46`	`+arr = [5,4,3,2,1]`
	`47`	`+print(inversion_count(arr,0,len(arr)-1))`

Comments

(0)