Compilare: main.cpp: In function 'int stoint(std::__cxx11::string)': main.cpp:12:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'void Solve(std::__cxx11::string, std::__cxx11::string, int&, int&, int&)': main.cpp:34:15: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] char op = NULL; ^~~~ main.cpp:36:82: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = i; (part == "stanga" && s[i - 1] != '=') || (part == "dreapta" && i < s.size()); ++i) ~~^~~~~~~~~~ main.cpp:47:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i] == '+' || s[i] == '-' || s[i] == '=' || i >= s.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:49:25: warning: NULL used in arithmetic [-Wpointer-arith] op = (op == NULL ? '+' : op); ^~~~