View Compilation Error

0_0_8875957_8283.cpp: In function `void DFS(int)':
0_0_8875957_8283.cpp:21: error: `in' undeclared (first use this function)
0_0_8875957_8283.cpp:21: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8875957_8283.cpp:21: error: expected `;' at end of input
0_0_8875957_8283.cpp:21: error: expected primary-expression at end of input
0_0_8875957_8283.cpp:21: error: expected `;' at end of input
0_0_8875957_8283.cpp:21: error: expected primary-expression at end of input
0_0_8875957_8283.cpp:21: error: expected `)' at end of input
0_0_8875957_8283.cpp:21: error: expected primary-expression at end of input
0_0_8875957_8283.cpp:21: error: expected `;' at end of input
0_0_8875957_8283.cpp:21: error: expected `}' at end of input