Compilare: main.cpp: In function 'int main()': main.cpp:118:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sir.size(); i++) ~~^~~~~~~~~~~~ main.cpp:120:31: warning: array subscript has type 'char' [-Wchar-subscripts] frecvLit[i + 1][sir[i]] = 1 + frecvLit[i][sir[i]]; ^ main.cpp:120:57: warning: array subscript has type 'char' [-Wchar-subscripts] frecvLit[i + 1][sir[i]] = 1 + frecvLit[i][sir[i]]; ^