View Compilation Error

1039041_0_0_22940.cpp:6:16:  set: No such file or directory
1039041_0_0_22940.cpp: In function `void run()':
1039041_0_0_22940.cpp:26: error: `multiset' undeclared (first use this function)
1039041_0_0_22940.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
1039041_0_0_22940.cpp:26: error: expected primary-expression before '>' token
1039041_0_0_22940.cpp:26: error: `s' undeclared (first use this function)
1039041_0_0_22940.cpp:40: error: expected primary-expression before '>' token
1039041_0_0_22940.cpp:40: error: missing template arguments before "it"
1039041_0_0_22940.cpp:40: error: expected `;' before "it"
1039041_0_0_22940.cpp:41: error: `it' undeclared (first use this function)