View Compilation Error

0_0_5337923_10237.cpp: In function `void eg(int, int)':
0_0_5337923_10237.cpp:20: error: `k' undeclared (first use this function)
0_0_5337923_10237.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5337923_10237.cpp: In function `long long int combination(int, int)':
0_0_5337923_10237.cpp:27: error: `aa' undeclared (first use this function)
0_0_5337923_10237.cpp:27: error: `bb' undeclared (first use this function)
0_0_5337923_10237.cpp:28: error: `pp' undeclared (first use this function)