Here in this problem problem it is said that for n jobs, given is the base price p for each job and an extra charge s for every pair of jobs (i, j), meaning that you have to pay additional s for job i, if and only if job j was completed before, you are to compute the minimum total costs needed to finish all jobs. constraint: 1 <= tc <= 100, 1 <= n <= 14 and base price 1 <= p <= 100000. I noticed some people solved it in O(2^n * n^2) using bitmask dp. As n is 14 so the complexity is approximately 321426400(> 1e8) considering 100 tc as well. How come it passes in 1 sec? An AC Code