View Compilation Error

0_0_10570838_15653.c:4:17: vector: No such file or directory
0_0_10570838_15653.c:7: error: syntax error before "namespace"
0_0_10570838_15653.c:12: error: syntax error before '<' token
0_0_10570838_15653.c: In function `dfs':
0_0_10570838_15653.c:16: error: `x' undeclared (first use in this function)
0_0_10570838_15653.c:16: error: (Each undeclared identifier is reported only once
0_0_10570838_15653.c:16: error: for each function it appears in.)
0_0_10570838_15653.c: In function `main':
0_0_10570838_15653.c:60: error: `x' undeclared (first use in this function)