Added Matrix Expo and Mo's Algorithm #1022
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Matrix Exponentiation (also known as matrix power, repeated squaring) is a technique used to solve linear recurrences. This technique is very useful in competitive programming when dealing with linear recurrences (appears along Dynamic Programming).
Example to calculate the 10^18th fibonacci series term, it can not be done using Recursion, or DP but using matrix expo.
Mo's algorithm is one of the very popular range series algorithm.