YES
We show the termination of the TRS R:

  nonZero(|0|()) -> false()
  nonZero(s(x)) -> true()
  p(s(|0|())) -> |0|()
  p(s(s(x))) -> s(p(s(x)))
  id_inc(x) -> x
  id_inc(x) -> s(x)
  random(x) -> rand(x,|0|())
  rand(x,y) -> if(nonZero(x),x,y)
  if(false(),x,y) -> y
  if(true(),x,y) -> rand(p(x),id_inc(y))


-- SCC decomposition.

Consider the dependency pair problem (P, R), where P consists of

p1: p#(s(s(x))) -> p#(s(x))
p2: random#(x) -> rand#(x,|0|())
p3: rand#(x,y) -> if#(nonZero(x),x,y)
p4: rand#(x,y) -> nonZero#(x)
p5: if#(true(),x,y) -> rand#(p(x),id_inc(y))
p6: if#(true(),x,y) -> p#(x)
p7: if#(true(),x,y) -> id_inc#(y)

and R consists of:

r1: nonZero(|0|()) -> false()
r2: nonZero(s(x)) -> true()
r3: p(s(|0|())) -> |0|()
r4: p(s(s(x))) -> s(p(s(x)))
r5: id_inc(x) -> x
r6: id_inc(x) -> s(x)
r7: random(x) -> rand(x,|0|())
r8: rand(x,y) -> if(nonZero(x),x,y)
r9: if(false(),x,y) -> y
r10: if(true(),x,y) -> rand(p(x),id_inc(y))

The estimated dependency graph contains the following SCCs:

  {p3, p5}
  {p1}


-- Reduction pair.

Consider the dependency pair problem (P, R), where P consists of

p1: rand#(x,y) -> if#(nonZero(x),x,y)
p2: if#(true(),x,y) -> rand#(p(x),id_inc(y))

and R consists of:

r1: nonZero(|0|()) -> false()
r2: nonZero(s(x)) -> true()
r3: p(s(|0|())) -> |0|()
r4: p(s(s(x))) -> s(p(s(x)))
r5: id_inc(x) -> x
r6: id_inc(x) -> s(x)
r7: random(x) -> rand(x,|0|())
r8: rand(x,y) -> if(nonZero(x),x,y)
r9: if(false(),x,y) -> y
r10: if(true(),x,y) -> rand(p(x),id_inc(y))

The set of usable rules consists of

  r1, r2, r3, r4, r5

Take the reduction pair:

  generalized weighted path order (>=MG, >G)
  
    base order 1:
  
      trivial reduction triple (T x T, T x T, Φ)
  
    base order 2:
  
      lexicographic combination of reduction triples:
      
        1. marked-algebra reduction triple (>=A, >=A!, >A!):
        
          max/plus interpretation on natural numbers:
          
            rand#_A(x1,x2) = max{1, x1 - 3}
            if#_A(x1,x2,x3) = max{1, x1 - 14, x2 - 3}
            nonZero_A(x1) = max{0, x1 - 2}
            true_A = 13
            p_A(x1) = max{4, x1 - 6}
            id_inc_A(x1) = max{29, x1 + 17}
            |0|_A = 1
            false_A = 0
            s_A(x1) = x1 + 15
            rand#!_A(x1,x2) = max{11, x1 + 5}
            if#!_A(x1,x2,x3) = max{10, x1 - 1, x2 + 4}
            nonZero!_A(x1) = max{4, x1 - 16}
            true!_A = 3
            p!_A(x1) = max{14, x1 - 50}
            id_inc!_A(x1) = x1 + 15
            |0|!_A = 13
            false!_A = 5
            s!_A(x1) = max{14, x1 - 16}
        
        2. marked-algebra reduction triple (>=A, >=A!, >A!):
        
          max/plus interpretation on natural numbers:
          
            rand#_A(x1,x2) = max{4, x1 - 12}
            if#_A(x1,x2,x3) = max{4, x1 - 2, x2 - 12}
            nonZero_A(x1) = 3
            true_A = 1
            p_A(x1) = max{16, x1 - 12}
            id_inc_A(x1) = x1 + 3
            |0|_A = 2
            false_A = 1
            s_A(x1) = max{10, x1 - 17}
            rand#!_A(x1,x2) = 2
            if#!_A(x1,x2,x3) = max{0, x1 - 4}
            nonZero!_A(x1) = max{3, x1 - 14}
            true!_A = 1
            p!_A(x1) = max{6, x1 - 12}
            id_inc!_A(x1) = 2
            |0|!_A = 5
            false!_A = 4
            s!_A(x1) = max{14, x1 - 3}
        
  
    partial status:
  
      pi(rand#) = []
      pi(if#) = []
      pi(nonZero) = [1]
      pi(true) = []
      pi(p) = [1]
      pi(id_inc) = [1]
      pi(|0|) = []
      pi(false) = []
      pi(s) = []

The following rules are removed:

  p1, p2

Then no dependency pair remains.

-- Reduction pair.

Consider the dependency pair problem (P, R), where P consists of

p1: p#(s(s(x))) -> p#(s(x))

and R consists of:

r1: nonZero(|0|()) -> false()
r2: nonZero(s(x)) -> true()
r3: p(s(|0|())) -> |0|()
r4: p(s(s(x))) -> s(p(s(x)))
r5: id_inc(x) -> x
r6: id_inc(x) -> s(x)
r7: random(x) -> rand(x,|0|())
r8: rand(x,y) -> if(nonZero(x),x,y)
r9: if(false(),x,y) -> y
r10: if(true(),x,y) -> rand(p(x),id_inc(y))

The set of usable rules consists of

  (no rules)

Take the reduction pair:

  generalized weighted path order (>=MG, >G)
  
    base order 1:
  
      trivial reduction triple (T x T, T x T, Φ)
  
    base order 2:
  
      lexicographic combination of reduction triples:
      
        1. marked-algebra reduction triple (>=A, >=A!, >A!):
        
          max/plus interpretation on natural numbers:
          
            p#_A(x1) = 0
            s_A(x1) = max{1, x1 - 8}
            p#!_A(x1) = max{1, x1 - 10}
            s!_A(x1) = max{5, x1 - 8}
        
        2. marked-algebra reduction triple (>=A, >=A!, >A!):
        
          max/plus interpretation on natural numbers:
          
            p#_A(x1) = 0
            s_A(x1) = max{4, x1 - 9}
            p#!_A(x1) = max{1, x1 - 5}
            s!_A(x1) = 0
        
  
    partial status:
  
      pi(p#) = [1]
      pi(s) = [1]

The following rules are removed:

  p1

Then no dependency pair remains.