Compilare: main.cpp: In function 'void prec()': main.cpp:15:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(i=1;i<s.size();){ | ~^~~~~~~~~ main.cpp: In function 'void kmp()': main.cpp:32:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | while(i<s1.size()){ | ~^~~~~~~~~~ main.cpp:35:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | if(j==s.size()){ | ~^~~~~~~~~~