Compilare: user.cpp: In function ‘int main()’: user.cpp:51:70: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(char i='a';i<='z';i++) for(char j='a';j<='z';j++) fin>>cost[i][j]; ^ user.cpp:51:73: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(char i='a';i<='z';i++) for(char j='a';j<='z';j++) fin>>cost[i][j]; ^