Prefix Sums problems
Problem Name
Online Judge
Contest
Difficulty Level
1
Nikita and string
Codeforces
Codeforces Round #442 (Div. 2)
2
2
Star sky
Codeforces
Codeforces Round #427 (Div. 2)
3
3
Monitor
Codeforces
Educational Codeforces Round 28
6