Expected Array

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Charvs has an array A of size N consisting of all 0s. Now she performs the following operation M times: Randomly choose two indices i and j (i <= j). Increment the values of A[i], A[i+1],. , A[j] by K. After the M operations, you need to report the expected values of A[0], A[1], A[2],. , A[N]. If the expected value is P/Q, output it as (P*R)%1000000007 where R is modulo inverse of Q with respect

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solution.cppC++17

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