I Was Overcomplicating This Prefix Sum Problem…

I was overcomplicating this Prefix Sum problem… and the key was actually much simpler. In this problem, we're given only the signs of the prefix sums — +, -, and 0 — and need to determine the minimum possible cost of the original array. The interesting part is that we don't need to actually construct the entire array. By looking carefully at the patterns of consecutive + and - values and how they interact with 0, we can derive the minimum cost using a few simple observations. In this video, I'll break down those observations and show how they lead to a simple O(N) solution. Topics covered: Prefix Sum Dynamic Programming / DP observation Prefix Sum Signs Pattern-based problem solving Constructing the minimum possible cost O(N) solution Competitive Programming If you enjoy learning DSA and Competitive Programming through interesting problem-solving tricks, subscribe and follow the journey! Problem Link: https://codeforces.com/contest/2260/p... Solution : https://codeforces.com/contest/2260/s... #CompetitiveProgramming #PrefixSum #DSA #Java #Codeforces #DynamicProgramming #Programming