subarrays

Good-SubArrays Problem (Past Contest) [help] (8)
How to get frequency of a character in range where char frequency is stored in prefix array [help] (1)
Find sum of modified subarray [help] (4)
How to find the count of the number of subarrays whose max=k ? [general] (3)
What is most efficient method to find all posible sub array in a given array? [general] (6)