Compilare: main.cpp: In function 'int main()': main.cpp:41:29: warning: array subscript has type 'char' [-Wchar-subscripts] 41 | last[i][0] = fr[a[i]]; | ^ main.cpp:42:16: warning: array subscript has type 'char' [-Wchar-subscripts] 42 | fr[a[i]] = i; | ^ main.cpp:48:29: warning: array subscript has type 'char' [-Wchar-subscripts] 48 | last[i][1] = fr[b[i]]; | ^ main.cpp:49:16: warning: array subscript has type 'char' [-Wchar-subscripts] 49 | fr[b[i]] = i; | ^ main.cpp:31:18: warning: unused variable 'l' [-Wunused-variable] 31 | int i, j, k, l, n, m; | ^