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View Compilation Error

0_0_36109772_20961.cpp: In function 'int main()':
0_0_36109772_20961.cpp:20:2: error: 'ios' has not been declared
  ios::sync_with_stdio(false);cin.tie(0);
  ^
0_0_36109772_20961.cpp:20:30: error: 'cin' was not declared in this scope
  ios::sync_with_stdio(false);cin.tie(0);
                              ^
0_0_36109772_20961.cpp:20:30: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_36109772_20961.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_36109772_20961.cpp:25:5: error: 'i' was not declared in this scope
   f(i, 1, n)add(i, 1);
     ^
0_0_36109772_20961.cpp:25:12: error: 'f' was not declared in this scope
   f(i, 1, n)add(i, 1);
            ^
0_0_36109772_20961.cpp:26:3: error: 'string' was not declared in this scope
   string op;int x;
   ^
0_0_36109772_20961.cpp:26:3: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iosfwd:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_36109772_20961.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stringfwd.h:62:33: note:   'std::string'
   typedef basic_string<char>    string;   
                                 ^
0_0_36109772_20961.cpp:27:3: error: 'stack' was not declared in this scope
   stack<int> st;
   ^
0_0_36109772_20961.cpp:27:3: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/stack:61:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:88,
                 from 0_0_36109772_20961.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:99:11: note:   'std::stack'
     class stack
           ^
0_0_36109772_20961.cpp:27:9: error: expected primary-expression before 'int'
   stack<int> st;
         ^
0_0_36109772_20961.cpp:31:11: error: 'op' was not declared in this scope
    cin >> op;
           ^
0_0_36109772_20961.cpp:38:6: error: 'st' was not declared in this scope
      st.push(x);
      ^
0_0_36109772_20961.cpp:44:9: error: 'st' was not declared in this scope
     if (st.empty())continue;
         ^
0_0_36109772_20961.cpp:45:15: error: 'st' was not declared in this scope
     int now = st.top();st.pop();
               ^


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