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View Compilation Error

0_0_37214363_20304.cpp: In function 'int main()':
0_0_37214363_20304.cpp:16:26: error: call of overloaded 'stoi(char&)' is ambiguous
             s=stoi(a[i--])+stoi(b[i--]);
                          ^
0_0_37214363_20304.cpp:16:26: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37214363_20304.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note: int std::stoi(const string&, std::size_t*, int) <near match>
   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note:   no known conversion for argument 1 from 'char' to 'const string& {aka const std::basic_string<char>&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note: int std::stoi(const wstring&, std::size_t*, int) <near match>
   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note:   no known conversion for argument 1 from 'char' to 'const wstring& {aka const std::basic_string<wchar_t>&}'
0_0_37214363_20304.cpp:16:39: error: call of overloaded 'stoi(char&)' is ambiguous
             s=stoi(a[i--])+stoi(b[i--]);
                                       ^
0_0_37214363_20304.cpp:16:39: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37214363_20304.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note: int std::stoi(const string&, std::size_t*, int) <near match>
   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note:   no known conversion for argument 1 from 'char' to 'const string& {aka const std::basic_string<char>&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note: int std::stoi(const wstring&, std::size_t*, int) <near match>
   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note:   no known conversion for argument 1 from 'char' to 'const wstring& {aka const std::basic_string<wchar_t>&}'
0_0_37214363_20304.cpp:17:19: error: cannot convert 'std::string {aka std::basic_string<char>}' to 'char' in assignment
             c[l--]=to_string((k+s)%10);
                   ^
0_0_37214363_20304.cpp:21:28: error: call of overloaded 'stoi(char&)' is ambiguous
             s=k+stoi(b[j--]);
                            ^
0_0_37214363_20304.cpp:21:28: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37214363_20304.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note: int std::stoi(const string&, std::size_t*, int) <near match>
   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note:   no known conversion for argument 1 from 'char' to 'const string& {aka const std::basic_string<char>&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note: int std::stoi(const wstring&, std::size_t*, int) <near match>
   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note:   no known conversion for argument 1 from 'char' to 'const wstring& {aka const std::basic_string<wchar_t>&}'
0_0_37214363_20304.cpp:22:19: error: cannot convert 'std::string {aka std::basic_string<char>}' to 'char' in assignment
             c[l--]=to_string(s%10);
                   ^
0_0_37214363_20304.cpp:26:28: error: call of overloaded 'stoi(char&)' is ambiguous
             s=k+stoi(a[i--]);
                            ^
0_0_37214363_20304.cpp:26:28: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_37214363_20304.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note: int std::stoi(const string&, std::size_t*, int) <near match>
   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2858:3: note:   no known conversion for argument 1 from 'char' to 'const string& {aka const std::basic_string<char>&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note: int std::stoi(const wstring&, std::size_t*, int) <near match>
   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
   ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2961:3: note:   no known conversion for argument 1 from 'char' to 'const wstring& {aka const std::basic_string<wchar_t>&}'
0_0_37214363_20304.cpp:27:19: error: cannot convert 'std::string {aka std::basic_string<char>}' to 'char' in assignment
             c[l--]=to_string(s%10);
                   ^


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