Compilare: main.cpp: In function 'int kmp(int, std::string)': main.cpp:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(i=1; i<c.size(); i++) | ~^~~~~~~~~ main.cpp:23:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | if(pi[i]==s.size()) | ~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:40:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(i=0; i<b.size(); i++) | ~^~~~~~~~~ main.cpp:35:39: warning: variable 'cnt' set but not used [-Wunused-but-set-variable] 35 | int n, m, i, first=0, x=0, start, cnt; | ^~~ main.cpp: In function 'int kmp(int, std::string)': main.cpp:16:20: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized] 16 | while(k!=0 && c[k]!=c[i]) main.cpp:12:12: note: 'k' was declared here 12 | int i, k; | ^ main.cpp: In function 'int main()': main.cpp:62:17: warning: 'start' may be used uninitialized [-Wmaybe-uninitialized] 62 | out<<start<<" "<<x; | ^~~ main.cpp:35:32: note: 'start' was declared here 35 | int n, m, i, first=0, x=0, start, cnt; | ^~~~~