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View Compilation Error

0_0_7186357_503.cpp: In function `int fun(int)':
0_0_7186357_503.cpp:4: error: `y0' undeclared (first use this function)
0_0_7186357_503.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7186357_503.cpp:4: error: stray '@' in program
0_0_7186357_503.cpp:4: error: expected `)' before numeric constant


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