Compilare: main.cpp: In function 'int main()': main.cpp:198:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 198 | for(int z = 0; z < s.size(); z++) | ~~^~~~~~~~~~ main.cpp:200:16: warning: array subscript has type 'char' [-Wchar-subscripts] 200 | ap[s[z]]++; | ^ main.cpp:204:19: warning: array subscript has type 'char' [-Wchar-subscripts] 204 | sp[z][x] = sp[z-1][x] + (s[z] == x); | ^ main.cpp:204:32: warning: array subscript has type 'char' [-Wchar-subscripts] 204 | sp[z][x] = sp[z-1][x] + (s[z] == x); | ^