Compilare: main.cpp: In function 'int main()': main.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:80:36: warning: suggest parentheses around assignment used as truth value [-Wparentheses] else if (v[i] = '2') ^ main.cpp:89:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i] != v[i] || s.size() > n) ~~~~~~~~~^~~