View Compilation Error

0_0_35066368_21163.cpp:12:6: error: expected nested-name-specifier before '?' token
 using?namespace?std;??
      ^
0_0_35066368_21163.cpp:12:21: error: expected unqualified-id before '?' token
 using?namespace?std;??
                     ^
0_0_35066368_21163.cpp:15:4: error: expected unqualified-id before '?' token
 ll;??
    ^
0_0_35066368_21163.cpp:17:22: error: expected unqualified-id before '?' token
 const?int?mx?=?1e5+5;??
                      ^
0_0_35066368_21163.cpp:24:2: error: 'a' does not name a type
 }a[mx];??
  ^
0_0_35066368_21163.cpp:24:8: error: expected unqualified-id before '?' token
 }a[mx];??
        ^
0_0_35066368_21163.cpp:30:2: error: expected unqualified-id before '?' token
 }??
  ^
0_0_35066368_21163.cpp:32:17: error: expected unqualified-id before '?' token
 multiset<int>st;??
                 ^