View Compilation Error

0_0_21018224_26456.cpp: In function 'double getDis(const Node&, const Node&)':
0_0_21018224_26456.cpp:25:8: error: redefinition of 'double getDis(const Node&, const Node&)'
 double getDis(const Node &a, const Node &b)
        ^
0_0_21018224_26456.cpp:21:8: note: 'double getDis(const Node&, const Node&)' previously defined here
 double getDis(const Node &a, const Node &b)
        ^