Discussion about Standard Template Library (STLs) such as (Pair, Map, Multimap, Set, Multiset, and Priority Queue,)
Materials:
Problem-B (Two-gram) Link: https://codeforces.com/contest/977/problem/B
Solution: https://ideone.com/hWyjLG
Problem-A (Anton and letters) Link: https://codeforces.com/contest/443/problem/A
Solution: https://ideone.com/uMXZpt
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