A Simple Equation

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Statement Given N,A,B,C, find how many solutions exist to the equation : a + b + c ≤ N, such that 0 ≤ a ≤ A, 0 ≤ b ≤ B, 0 ≤ c ≤ C. Input The first line contains the number of test cases T. Each test case contains 4 integers, N,A,B,C. 0 ≤ N,A,B,C ≤ 2500 Output Output T lines, one for each test case. Sample Input 2 4 3 2 1 1 1 1 1 Sample Output 20 4

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solution.cppC++17

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