Compilare: main.cpp: In function 'void init(int)': main.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(int l=start;l<s.size();l++){ | ~^~~~~~~~~ main.cpp: In function 'void add(int)': main.cpp:33:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(int l=start;l<s.size();l++){ | ~^~~~~~~~~ main.cpp: In function 'void check(int)': main.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int l=start;l<s.size();l++){ | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(j=0;j<s.size();j++) init(j); | ~^~~~~~~~~ main.cpp:69:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for(j=0;j<s.size();j++) add(j); | ~^~~~~~~~~ main.cpp:74:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(j=0;j<s.size();j++) check(j); | ~^~~~~~~~~