View Compilation Error

0_0_15098381_2660.cpp: In function 'int main()':
0_0_15098381_2660.cpp:16:5: error: 'string' was not declared in this scope
     string line;
     ^
0_0_15098381_2660.cpp:17:5: error: 'stringstream' was not declared in this scope
     stringstream stream;
     ^
0_0_15098381_2660.cpp:18:13: error: 'cin' was not declared in this scope
     getline(cin, line);
             ^
0_0_15098381_2660.cpp:18:18: error: 'line' was not declared in this scope
     getline(cin, line);
                  ^
0_0_15098381_2660.cpp:18:22: error: 'getline' was not declared in this scope
     getline(cin, line);
                      ^
0_0_15098381_2660.cpp:19:5: error: 'stream' was not declared in this scope
     stream<<line;
     ^
0_0_15098381_2660.cpp:24:9: error: 'v' was not declared in this scope
         v.clear();
         ^
0_0_15098381_2660.cpp:30:9: error: 'cout' was not declared in this scope
         cout<<a<<endl;
         ^
0_0_15098381_2660.cpp:30:18: error: 'endl' was not declared in this scope
         cout<<a<<endl;
                  ^