Compilare: main.cpp: In function 'void mov(std::__cxx11::string&, int)': main.cpp:11:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k; i < a0.size(); i++) ~~^~~~~~~~~~~ main.cpp: In function 'void del(std::__cxx11::string&, std::__cxx11::string&)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp:26:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a.size() > j) { ~~~~~~~~~^~~ main.cpp: In function 'bool common(std::__cxx11::string, std::__cxx11::string)': main.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) { ~~^~~~~~~~~~ main.cpp:35:16: warning: array subscript has type 'char' [-Wchar-subscripts] fa[a[i]] = 1; ^ main.cpp:36:16: warning: array subscript has type 'char' [-Wchar-subscripts] fb[b[i]] = 1; ^ main.cpp: In function 'void rep_common(std::__cxx11::string&, std::__cxx11::string&)': main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) { ~~^~~~~~~~~~ main.cpp:47:16: warning: array subscript has type 'char' [-Wchar-subscripts] fa[a[i]] = 1; ^ main.cpp:48:16: warning: array subscript has type 'char' [-Wchar-subscripts] fb[b[i]] = 1; ^ main.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size(); i++) { ~~^~~~~~~~~~ main.cpp:51:21: warning: array subscript has type 'char' [-Wchar-subscripts] if (!fb[a[i]]) a[i] = '.'; ^ main.cpp:52:21: warning: array subscript has type 'char' [-Wchar-subscripts] if (!fa[b[i]]) b[i] = '.'; ^