That was my first thought too. I thought the page was referring to DP/Memoization[1], initially. Thats the most useful concept I learnt about a decade back, and

That was my first thought too. I thought the page was referring to DP/Memoization[1], initially. Thats the most useful concept I learnt about a decade back, and was fortunate to be able to find a case in real-life to apply it. I have often a hard time explaining it though. But very simply (the way I explain) it is, you compute and keep lot of results for lower values e.g. value of f(x,y) where x,y are less than some larger n,m respectively. And for computing f(n,m) you would need to compute f(x,y) a number of times for varying values of x,y. So if you keep it in memory. You save hell lot of a computing time. And your program runs in a fraction of time of what it would take other wise. [1] https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/ https://www.topcoder.com/community/data-science/data-science... Edit: minor correction