View Compilation Error

0_0_3229973_20643.cpp: In function `int pop(int&)':
0_0_3229973_20643.cpp:39: error: redefinition of `int pop(int&)'
0_0_3229973_20643.cpp:30: error: `int pop(int&)' previously defined here
0_0_3229973_20643.cpp:44: error: `l' undeclared (first use this function)
0_0_3229973_20643.cpp:44: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3229973_20643.cpp:44: error: `r' undeclared (first use this function)