Programming

scriptCTF 2025 🚩 Back From Where 💻 Problem Statement The problem can be stated as follows: You are given an \(N \times N\) grid of integers \(a_{ij}\). A path is considered valid if it starts top-left and only moves down or right. For each cell \((i,j)\) find the maximum number of trailing zeros in the product of values along any valid path. Writeup 📜 Number of trailing zero’s The first question is how to practically calculate the number of trailing zero’s of a number $m$. The answer is pretty straightforward: we find how many times $m$ is divisible by $5$ and by $2$ the number of trailing zero’s is how many five’s and two’s can be matched together. Suppose $m$ is divisible by five $f$ times and by two $t$ times, then the number of trailing zero’s is \(min(f, t)\). ...