View Compilation Error

0_0_33609740_27799.cpp:21:23: error: 'in' has not been declared
 void add_edge(int eu, in
                       ^
0_0_33609740_27799.cpp:21:23: error: expected ',' or '...' at end of input
0_0_33609740_27799.cpp:21:23: error: expected ')' at end of input
0_0_33609740_27799.cpp:21:23: error: expected initializer at end of input