Compilare: main.cpp: In function 'std::pair<int, std::array<int, 1000> > strmatch(const std::string&, const std::string&)': main.cpp:23:16: warning: array subscript has type 'char' [-Wchar-subscripts] 23 | marked[a[0]] = 0; | ^ main.cpp:29:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (int i = 1, k = -1; i < a.size(); ++i) { | ~~^~~~~~~~~~ main.cpp:31:20: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | marked[a[i]] = i; | ^ main.cpp:50:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i = 0, q = -1; i < b.size(); ++i) { | ~~^~~~~~~~~~ main.cpp:58:30: warning: array subscript has type 'char' [-Wchar-subscripts] 58 | if (marked[b[pos]] == -1) { | ^ main.cpp:63:36: warning: array subscript has type 'char' [-Wchar-subscripts] 63 | i = pos - marked[b[pos]]; | ^ main.cpp:69:24: warning: array subscript has type 'char' [-Wchar-subscripts] 69 | if (marked[b[i]] == -1) { | ^ main.cpp:88:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | if (q + 1 == a.size()) { | ~~~~~~^~~~~~~~~~~