294825_0_21006.cpp: In function `int main()':
294825_0_21006.cpp:5: error: `n' undeclared (first use this function)
294825_0_21006.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
294825_0_21006.cpp:8: error: `a' undeclared (first use this function)
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