Compilare: main.cpp: In function 'int main()': main.cpp:15:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i=0; i<s.size(); i++) { | ~^~~~~~~~~ main.cpp:18:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | while(st>0&&dr<s.size()-1&&(s[st-1]==s[dr+1])) { | ~~^~~~~~~~~~~ main.cpp:35:47: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while(st>0&&dr<s.size()-1&&(s[st-1]==s[dr+1])) { | ~~^~~~~~~~~~~ main.cpp:45:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:8:40: warning: unused variable 'mid' [-Wunused-variable] 8 | int L=-1,R=-1,m,mp,st=-1,dr=-1,mid=0,left,S=0; | ^~~