Compilare: main.cpp: In function 'void insertst(std::string)': main.cpp:52:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:64:13: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(i==s.size()-1) | ~^~~~~~~~~~~~ main.cpp: In function 'void delst(std::string)': main.cpp:74:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp: In function 'void printst(std::string)': main.cpp:99:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp: In function 'void printpref(std::string)': main.cpp:116:13: warning: unused variable 'ok' [-Wunused-variable] 116 | int ok=1; | ^~ main.cpp:117:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 117 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:146:9: warning: unused variable 't' [-Wunused-variable] 146 | int t=1; | ^