Compilare: main.cpp: In function 'int main()': main.cpp:17:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i=0;i<a.size();i++) { | ~^~~~~~~~~ main.cpp:21:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while(i+z[i]<a.size() && a[z[i]]==a[i+z[i]]) | ~~~~~~^~~~~~~~~ main.cpp:32:34: 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=a.size()-b.size();i<a.size();i++) { | ~^~~~~~~~~ main.cpp:33:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if(z[i]>=a.size()-b.size()){matches++;m.push_back(i-a.size()+b.size());} | ~~~~^~~~~~~~~~~~~~~~~~~