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Chef and Subarray

Chef wants to attend an event, but outside the event there is one security guard. If chef wants to attend that event, chef needs to solve the given problem by security guard. Security guard gave one array and $2$ numbers $L$ and $R$. Chef have to find the number of sub arrays which has sum of elements lying in the range of given two number($L$ and $R$) including both numbers. Chef needs your help

HINT LADDERno hints yet
L1 Observation
L2 Technique
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solution.cppC++17

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