Compilare: main.cpp: In function 'bool solve(std::__cxx11::string, int)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:45:32: warning: suggest parentheses around assignment used as truth value [-Wparentheses] else if (v[i] = '2') ^ main.cpp:54:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i] != v[i] || s.size() > n) ~~~~~~~~~^~~