Highest frequency

[Vishal123 (Vishal Modani)]

getting tle in 2 test cases.
ide: https://ide.codingblocks.com/s/286230

[vatsal38 (vatsal agarwal)]

@Vishal123 use unordered_map instead of map as map takes logn time and unordered o(1) time

Coding Blocks IDE

dont forget to hit like and mark resolved if cleared