View Compilation Error

0_0_4579624_28102.c:8:19: iostream: No such file or directory
0_0_4579624_28102.c:10:14: set: No such file or directory
0_0_4579624_28102.c:11:20: algorithm: No such file or directory
0_0_4579624_28102.c:12: error: syntax error before "namespace"
0_0_4579624_28102.c: In function `main':
0_0_4579624_28102.c:19: error: `multiset' undeclared (first use in this function)
0_0_4579624_28102.c:19: error: (Each undeclared identifier is reported only once
0_0_4579624_28102.c:19: error: for each function it appears in.)
0_0_4579624_28102.c:19: error: syntax error before "int"
0_0_4579624_28102.c:20: error: syntax error before "int"
0_0_4579624_28102.c:22: error: `mset' undeclared (first use in this function)
0_0_4579624_28102.c:28: error: `iter1' undeclared (first use in this function)
0_0_4579624_28102.c:40: error: `iter2' undeclared (first use in this function)