View Compilation Error

0_0_11374099_19331.cpp: In function `int cal(int, int)':
0_0_11374099_19331.cpp:35: error: `n' undeclared (first use this function)
0_0_11374099_19331.cpp:35: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11374099_19331.cpp:38: error: `m' undeclared (first use this function)