Compilare: main.cpp: In function 'int main()': main.cpp:81:29: warning: array subscript has type 'char' [-Wchar-subscripts] 81 | last[i][0] = fr[a[i]]; | ^ main.cpp:82:16: warning: array subscript has type 'char' [-Wchar-subscripts] 82 | fr[a[i]] = i; | ^ main.cpp:88:29: warning: array subscript has type 'char' [-Wchar-subscripts] 88 | last[i][1] = fr[b[i]]; | ^ main.cpp:89:16: warning: array subscript has type 'char' [-Wchar-subscripts] 89 | fr[b[i]] = i; | ^ main.cpp:71:15: warning: unused variable 'k' [-Wunused-variable] 71 | int i, j, k; | ^ main.cpp:93:9: warning: unused variable 'i1' [-Wunused-variable] 93 | int i1 = 0, j1 = 0; | ^~ main.cpp:93:17: warning: unused variable 'j1' [-Wunused-variable] 93 | int i1 = 0, j1 = 0; | ^~ main.cpp:94:9: warning: unused variable 'len' [-Wunused-variable] 94 | int len = 0; | ^~~