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Problem A: Ezzat and Two Subsequences
Problem Link: https://codeforces.com/contest/1557/problem/A
Code Link: https://codeforces.com/contest/1557/submission/125338028
Video Solution Link: https://youtu.be/Sb3Z9SYLz_c
Problem B: Moamen and k-subarrays
Problem Link: https://codeforces.com/contest/1557/problem/B
Code Link: https://codeforces.com/contest/1557/submission/125401807
Video Solution Link: https://youtu.be/52CAuerw78w
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