Compilare: user.cpp: In function ‘bool solve(std::string)’: user.cpp:22:57: warning: operation on ‘aCount’ may be undefined [-Wsequence-point] int aCount = aCount = count(str.begin(), str.end(), 'A'); ^ user.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (aCount == str.size() || aCount == 0) { ^