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View Compilation Error

0_0_36533194_31552.cpp: In function 'int main()':
0_0_36533194_31552.cpp:16:45: error: no matching function for call to 'make_pair(std::string&, std::string&)'
    map1.insert(make_pair<string,string>(s1,s));
                                             ^
0_0_36533194_31552.cpp:16:45: note: candidate is:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:61,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/map:60,
                 from 0_0_36533194_31552.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&)
     make_pair(_T1&& __x, _T2&& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:276:5: note:   template argument deduction/substitution failed:
0_0_36533194_31552.cpp:16:45: note:   cannot convert 's1' (type 'std::string {aka std::basic_string<char>}') to type 'std::basic_string<char>&&'
    map1.insert(make_pair<string,string>(s1,s));
                                             ^


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