Please explain your reasoning.

9. Determine the run times of the following two pieces of code, which do pretty much nothing. [6 points] sum=0fori=1tonnforj=1toiiisum++ and 1 10. What is the running time for the following code, which multiplies two nn matrices A and B, storing the result in C ? [4 points] for i=1 to n for j=1ton{C[i,j]=0fork=1tonC[i,j]=C[i,j]+A[i,k]B[k,j]