Step 1 :Find the oxidation number of manganese in Mnct and MnC4: \(\mathrm{Mn}^{1}\) in Mnct and \(\mathrm{Mn}^{-4}\) in MnC4
Step 2 :Compare the oxidation numbers of nitrogen in Mnct and MnC4: Nitrogen has the highest oxidation number in Mnct with \(-1\)
Step 3 :\boxed{\text{Final Answer: Oxidation number of manganese in Mnct is 1, in MnC4 is -4. Nitrogen has the highest oxidation number in Mnct with -1.}}