Chef And Strings

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Chef has $N$ strings with him. He knows his strings very well. A very intelligent guy named Frank comes along and asked him a few questions about the strings. Chef is busy right now, so you have to help him answer the queries by Frank There are $Q$ queries each containing 3 integers $L , R, C$ and 1 character $P$. You are supposed to tell how many strings from $L$ to $R$ have the character $P$ at

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solution.cppC++17

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