  The form of Dueck and K\"orner's exponent function for correct decoding
probability for discrete memoryless channels at rates above the capacity is
similar to the form of Csisz\'ar and K\"orner's exponent function for correct
decoding probability in lossy source coding for discrete memoryless sources at
rates below the rate distortion function. We recently gave a new algorithm for
computing Dueck and K\"orner's exponent. In this paper, we give an algorithm
for computing Csisz\'ar and K\"orner's exponent. The proposed algorithm can be
also used to compute cutoff rate and the rate distortion function.
