Compilare: main.cpp: In function 'void Back(int)': main.cpp:26:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 26 | if(OK(k)) | ^ main.cpp: In function 'int main()': main.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(j = 0; j < s[i].size(); j++) | ~~^~~~~~~~~~~~~ main.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(j = 0; j < s[i].size(); j++) | ~~^~~~~~~~~~~~~