Compilare: main.cpp: In function 'int main()': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:17:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:21:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | if(x>=s.size())x=s.size()-1; | ~^~~~~~~~~~ main.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if(x>=s.size())x=s.size()-1; | ~^~~~~~~~~~ main.cpp:47:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | if(k+1==s.size())cout<<"a"<<a<<endl; | ~~~^~~~~~~~~~ main.cpp:47:33: warning: 'a' may be used uninitialized [-Wmaybe-uninitialized] 47 | if(k+1==s.size())cout<<"a"<<a<<endl; | ^ main.cpp:9:17: note: 'a' was declared here 9 | int k,cnt=0,a; | ^