View Compilation Error

0_0_6389956_2069.cpp: In function `bool DFS(int)':
0_0_6389956_2069.cpp:13: error: `x' undeclared (first use this function)
0_0_6389956_2069.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6389956_2069.cpp:16: error: `G' undeclared (first use this function)
0_0_6389956_2069.cpp: In function `int main()':
0_0_6389956_2069.cpp:31: error: `G' undeclared (first use this function)
0_0_6389956_2069.cpp:32: error: `m' undeclared (first use this function)
0_0_6389956_2069.cpp:36: error: `x' undeclared (first use this function)
0_0_6389956_2069.cpp:36: error: `y' undeclared (first use this function)
0_0_6389956_2069.cpp: In function `int main()':
0_0_6389956_2069.cpp:74: error: redefinition of `int main()'
0_0_6389956_2069.cpp:30: error: `int main()' previously defined here