View Compilation Error

0_0_2138352_11893.c:2:14: set: No such file or directory
0_0_2138352_11893.c:3: error: syntax error before "namespace"
0_0_2138352_11893.c: In function `main':
0_0_2138352_11893.c:45: error: `set' undeclared (first use in this function)
0_0_2138352_11893.c:45: error: (Each undeclared identifier is reported only once
0_0_2138352_11893.c:45: error: for each function it appears in.)
0_0_2138352_11893.c:45: error: syntax error before "int"
0_0_2138352_11893.c:48: error: `s' undeclared (first use in this function)