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This is a port of my Clean answer.
r!n=foldr(f n)[[last r]]$initn|let r f n x(r@(a:_):s)|x>a=[x,n+a]:(x-n:r):s|y<-x:r=y:ss=foldr f[[last r]]$init r
Try it online!Try it online!
-1, -1 thanks to Laikoni
r!n=foldr(f n)[[last r]]$init r f n x(r@(a:_):s)|x>a=[x,n+a]:(x-n:r):s|y<-x:r=y:s
Try it online!
-1 thanks to Laikoni
r!n|let f x(r@(a:_):s)|x>a=[x,n+a]:(x-n:r):s|y<-x:r=y:s=foldr f[[last r]]$init r
