Compilare: main.cpp: In function 'int main()': main.cpp:37:24: warning: array subscript has type 'char' [-Wchar-subscripts] ++fq[sir[i]]; ^ main.cpp:38:43: warning: array subscript has type 'char' [-Wchar-subscripts] delta = delta + comb(fq[sir[i]]) - comb(fq[sir[i]] - 1); ^ main.cpp:38:62: warning: array subscript has type 'char' [-Wchar-subscripts] delta = delta + comb(fq[sir[i]]) - comb(fq[sir[i]] - 1); ^