Compilare: user.cpp: In function ‘void colect()’: user.cpp:24:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<sol.size();++j) ^ user.cpp:26:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int z=0;z<sol[j].size();++z)sl.push_back(sol[j][z]); ^ user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j!=sol.size()-1)sl.push_back(bs); ^ user.cpp: In function ‘void next_string()’: user.cpp:34:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && (s[i]!=',' && s[i]!='(' && s[i]!=')')) ^ user.cpp: In function ‘void evaluare()’: user.cpp:59:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size() && s[i]!=')') ^ user.cpp: In function ‘int main()’: user.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<s.size();++k) ^