View Compilation Error

0_0_6290964_31389.cpp:31: error: `M' was not declared in this scope
0_0_6290964_31389.cpp: In function `int main()':
0_0_6290964_31389.cpp:97: error: `edge' undeclared (first use this function)
0_0_6290964_31389.cpp:97: error: (Each undeclared identifier is reported only once for each function it appears in.)