View Compilation Error

0_0_6593669_4533.cpp: In function `void DFS(int)':
0_0_6593669_4533.cpp:40: error: `typeof' undeclared (first use this function)
0_0_6593669_4533.cpp:40: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6593669_4533.cpp:40: error: expected `;' before "iter"
0_0_6593669_4533.cpp:40: error: `iter' undeclared (first use this function)