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View Compilation Error

0_0_29613452_30859.cpp: In function 'int main()':
0_0_29613452_30859.cpp:23:26: error: no matching function for call to 'std::stack<int>::push(std::string&)'
                 q.push(s1);
                          ^
0_0_29613452_30859.cpp:23:26: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/stack:61:0,
                 from 0_0_29613452_30859.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:189:7: note: void std::stack<_Tp, _Sequence>::push(const value_type&) [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >; std::stack<_Tp, _Sequence>::value_type = int]
       push(const value_type& __x)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:189:7: note:   no known conversion for argument 1 from 'std::string {aka std::basic_string<char>}' to 'const value_type& {aka const int&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:194:7: note: void std::stack<_Tp, _Sequence>::push(std::stack<_Tp, _Sequence>::value_type&&) [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >; std::stack<_Tp, _Sequence>::value_type = int]
       push(value_type&& __x)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:194:7: note:   no known conversion for argument 1 from 'std::string {aka std::basic_string<char>}' to 'std::stack<int>::value_type&& {aka int&&}'


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