Compilare: main.cpp: In function 'void buildZ()': main.cpp:15:18: 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(int i=1;i<concat.length();++i){ | ~^~~~~~~~~~~~~~~~ main.cpp:19:48: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | while(concat[dr]==concat[dr-st]&&dr<concat.length()){ | ~~^~~~~~~~~~~~~~~~ main.cpp:32:25: 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(dr<concat.length() && concat[dr]==concat[dr-st]){ | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void findMatches()': main.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(int i=1;i<concat.length();++i){ | ~^~~~~~~~~~~~~~~~ main.cpp:46:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if(Z[i]==A.length()){ | ~~~~^~~~~~~~~~~~