Compilare: main.cpp: In function 'int main()': main.cpp:66:29: warning: array subscript has type 'char' [-Wchar-subscripts] 66 | last[i][0] = fr[a[i]]; | ^ main.cpp:67:16: warning: array subscript has type 'char' [-Wchar-subscripts] 67 | fr[a[i]] = i; | ^ main.cpp:73:29: warning: array subscript has type 'char' [-Wchar-subscripts] 73 | last[i][1] = fr[b[i]]; | ^ main.cpp:74:16: warning: array subscript has type 'char' [-Wchar-subscripts] 74 | fr[b[i]] = i; | ^ main.cpp:56:18: warning: unused variable 'l' [-Wunused-variable] 56 | int i, j, k, l, n, m; | ^