About the solution of error: invalid types 'int[int]' for array subscript

If the location of the error statement is an array, the reason for this error is roughly as follows:

Case 1. The current array and a variable name are duplicated.
In this case, oj reportsCE

Seeing that a blogger wrote that there may be two other cases, I haven't tested it myself. Guys, take it as a precaution.

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If the variable name is inconsistent or not defined, the report is this:

Then C++ and C do not have the prompt that the array index is out of bounds...