I sometimes get confused when to use greedy and when to use DP. I have this problem — https://mirror.codeforces.com/contest/455/problem/A where I thought my solution which is greedy would be correct but it went wrong on a 100 element array when submitted. I don't seem to find any mistake or failing test case for my solution. Can someone help? My solution: https://mirror.codeforces.com/contest/455/submission/299737860