View Compilation Error

0_0_2372115_24692.cpp: In function `void dfs(int, int)':
0_0_2372115_24692.cpp:51: error: `typeof' undeclared (first use this function)
0_0_2372115_24692.cpp:51: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2372115_24692.cpp:51: error: expected `;' before "it"
0_0_2372115_24692.cpp:51: error: `it' undeclared (first use this function)