View Compilation Error

0_0_6734190_20476.cpp: In function `int main()':
0_0_6734190_20476.cpp:30: error: could not convert `(&mat)->std::map<_Key, _Tp, _Compare, _Alloc>::find [with _Key = std::string, _Tp = int, _Compare = std::less<std::string>, _Alloc = std::allocator<std::pair<const std::string, int> >](((const std::string&)((const std::string*)(&string(((const char*)((char*)(&sx))), ((const std::allocator<char>&)((const std::allocator<char>*)(&allocator<char>()))))))))' to `bool'