Compilare: main.cpp: In function 'int main()': main.cpp:32:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int i=1; i<a.size(); i++) | ~^~~~~~~~~ main.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i=1; i<b.size(); i++) | ~^~~~~~~~~ main.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int i=1; i<=b.size(); i++) | ~^~~~~~~~~~ main.cpp:53:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int i=1; i+m-1<b.size(); i++) | ~~~~~^~~~~~~~~ main.cpp:54:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 54 | if(hash_substr(i,i+m-1)==hash_a) | ^ main.cpp:50:9: warning: unused variable 'n' [-Wunused-variable] 50 | int n=b.size()-1,m=a.size()-1; | ^