0_0_6543972_18962.cpp: In function `int main()':
0_0_6543972_18962.cpp:19: error: no match for 'operator&&' in '(&st)->std::set<_Key, _Compare, _Alloc>::find [with _Key = std::string, _Compare = std::less<std::string>, _Alloc = std::allocator<std::string>](((const std::string&)((const std::string*)(&std::basic_string<_CharT, _Traits, _Alloc>::substr(typename _Alloc::size_type, typename _Alloc::size_type) const [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>](0u, ((unsigned int)j)))))) && (&st)->std::set<_Key, _Compare, _Alloc>::find [with _Key = std::string, _Compare = std::less<std::string>, _Alloc = std::allocator<std::string>](((const std::string&)((const std::string*)(&std::basic_string<_CharT, _Traits, _Alloc>::substr(typename _Alloc::size_type, typename _Alloc::size_type) const [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>](((unsigned int)j), -1u)))))'
0_0_6543972_18962.cpp:19: note: candidates are: operator&&(bool, bool) <built-in>
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