Return the number of permutations of 1 to n so that prime numbers are at prime indices (1-indexed.) (Recall that an integer is prime if and only if it …
September 5, 2014
algorithms, beginner, c / c++, code, code library, math, optimization, programming languages, recursive, tricks
We all know the formula to compute value e (mathematical constant that is the base of the natural logarithm) is e = 1 + 1/1!+ 1/2!+ .....+ 1/n! Now, …