Materials:
Summary of the session (Prefix-Suffix & Sliding Window):
https://ideone.com/qg63xd
Problem CSUMQ - Cumulative Sum Query:
https://www.spoj.com/problems/CSUMQ/
Solution:
https://ideone.com/ut16r2
Problem B. Karen and Coffee:
https://codeforces.com/contest/816/problem/B
Solution:
https://ideone.com/vaN84L
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