Compilare: main.cpp: In function 'int main()': main.cpp:17:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | while(i < pat.length()) | ~~^~~~~~~~~~~~~~ main.cpp:26:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(i = 0; i < s.size(); ++i) | ~~^~~~~~~~~~ main.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | if(j == pat.size()){ | ~~^~~~~~~~~~~~~ main.cpp:25:16: warning: unused variable 'ans' [-Wunused-variable] 25 | int j = 0, ans = 0; | ^~~