Compilare: main.cpp: In function 'int main()': main.cpp:6:188: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 6 | bool palindrom(string s){int sl=s.length();for(int i=0;i<sl/2;i++) if(s[i]!=s[sl-1-i]) return false;return true;}int main(){string s,cs;fin>>s;if(palindrom(s)) fout<<s<<endl;for(int i=1;i<s.length();i++){cs=s;for(int j=i-1;j>=0;j--){cs+=s[j];}if(palindrom(cs)){fout<<cs;return 0;}}return 0;} | ~^~~~~~~~~~~