View Compilation Error

0_0_25750718_13828.cpp: In function 'bool topo()':
0_0_25750718_13828.cpp:35:11: error: ambiguating new declaration of 'bool topo()'
 bool topo()
           ^
0_0_25750718_13828.cpp:6:5: note: old declaration 'int topo()'
 int topo();
     ^