Compilare: main.cpp: In function 'void read(int&, int&)': main.cpp:33:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i] >= '0' && s[i] <= '9' && i < s.size()) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans.size() != n - 1){ ~~~~~~~~~~~^~~~~~~~