Compilare: main.cpp: In function 'int main()': main.cpp:19:38: warning: array subscript has type 'char' [-Wchar-subscripts] for(int i=0; i<12; i++) key1[t[i]] = i + '0', key2[i+'0'] = t[i]; ^ main.cpp:22:58: warning: array subscript has type 'char' [-Wchar-subscripts] for(int j=0; j<5; j++) s[i][j] = key1[s[i][j]]; ^ main.cpp:36:61: warning: array subscript has type 'char' [-Wchar-subscripts] { for(int j=0; j<5; j++) g << key2[s[i][j]]; ^