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View Compilation Error

0_0_36048914_25424.cpp: In function 'int main()':
0_0_36048914_25424.cpp:26:20: error: invalid conversion from 'std::string* {aka std::basic_string<char>*}' to 'char' [-fpermissive]
        j=s1.find(s2);
                    ^
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_36048914_25424.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:1897:7: note: initializing argument 1 of 'std::basic_string<_CharT, _Traits, _Alloc>::size_type std::basic_string<_CharT, _Traits, _Alloc>::find(_CharT, std::basic_string<_CharT, _Traits, _Alloc>::size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::basic_string<_CharT, _Traits, _Alloc>::size_type = long long unsigned int]'
       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
       ^


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