Leetcode judge fails for custom test cases: overflows, throws OutOfBounds

  • 0

    OutOfBounds test case:
    Online judge does not check for the case where m or n may be 0
    Passing in m=0, n=5 (Any number)
    Leetcode judge throws an exception for this test case:

    Line 4: java.lang.ArrayIndexOutOfBoundsException: -1

    This can be solved by adding a check:

    if(m == 0 || n == 0) {
        return 0;

    Overflow test case:
    Description states that m & n can have values upto 100. As the method returns an int, the method overflows for test case m=100 and n=100.
    For this test case, leetcode judge gives a negative answer = -2129403600

    The return type should be a long to support values of m & n ranging upto 100. For a math solution, in case only the result of a multiplication overflows (before dividing it and bringing back to int range), a long value should be used to store intermediate results, and an int value must be returned.

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