Compilare: main.cpp: In function 'long int sum()': main.cpp:40:21: warning: array subscript has type 'char' [-Wchar-subscripts] if(sol[i]==sol[n+j]) ^ main.cpp:41:20: warning: array subscript has type 'char' [-Wchar-subscripts] s+=a[i][j]; ^ main.cpp:41:23: warning: array subscript has type 'char' [-Wchar-subscripts] s+=a[i][j]; ^ main.cpp:43:23: warning: array subscript has type 'char' [-Wchar-subscripts] s-=a[i][j]; ^ main.cpp:43:26: warning: array subscript has type 'char' [-Wchar-subscripts] s-=a[i][j]; ^ main.cpp: In function 'int main()': main.cpp:54:21: warning: array subscript has type 'char' [-Wchar-subscripts] in >>a[i][j]; ^ main.cpp:54:24: warning: array subscript has type 'char' [-Wchar-subscripts] in >>a[i][j]; ^