View Compilation Error

0_0_4254333_23016.cpp:12: error: expected `]' before ';' token
0_0_4254333_23016.cpp: In function `void graham()':
0_0_4254333_23016.cpp:47: error: `v' undeclared (first use this function)
0_0_4254333_23016.cpp:47: error: (Each undeclared identifier is reported only once for each function it appears in.)