The Runtime Complexity (innermost) of the given CpxTRS could be proven to be BOUNDS(n^1, INF).

(0) Obligation:

Runtime Complexity TRS:
The TRS R consists of the following rules:

plus(x, y) → ifPlus(isZero(x), x, inc(y))
ifPlus(true, x, y) → p(y)
ifPlus(false, x, y) → plus(p(x), y)
times(x, y) → timesIter(0, x, y, 0)
timesIter(i, x, y, z) → ifTimes(ge(i, x), i, x, y, z)
ifTimes(true, i, x, y, z) → z
ifTimes(false, i, x, y, z) → timesIter(inc(i), x, y, plus(z, y))
isZero(0) → true
isZero(s(0)) → false
isZero(s(s(x))) → isZero(s(x))
inc(0) → s(0)
inc(s(x)) → s(inc(x))
inc(x) → s(x)
p(0) → 0
p(s(x)) → x
p(s(s(x))) → s(p(s(x)))
ge(x, 0) → true
ge(0, s(y)) → false
ge(s(x), s(y)) → ge(x, y)
f0(0, y, x) → f1(x, y, x)
f1(x, y, z) → f2(x, y, z)
f2(x, 1, z) → f0(x, z, z)
f0(x, y, z) → d
f1(x, y, z) → c

Rewrite Strategy: INNERMOST

(1) DecreasingLoopProof (EQUIVALENT transformation)

The following loop(s) give(s) rise to the lower bound Ω(n¹):
The rewrite sequence
isZero(s(s(x))) →⁺ isZero(s(x))
gives rise to a decreasing loop by considering the right hand sides subterm at position [].
The pumping substitution is [x / s(x)].
The result substitution is [ ].

(2) BOUNDS(n^1, INF)