View Compilation Error

0_0_2920380_1458.cpp: In function `int dfs(int)':
0_0_2920380_1458.cpp:13: error: stray '\163' in program
0_0_2920380_1458.cpp:13: error: stray '\177' in program
0_0_2920380_1458.cpp:14: error: `mark' undeclared (first use this function)
0_0_2920380_1458.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)