Compilare: user.cpp: In function ‘int main()’: user.cpp:17:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i][s[i]]=1; ^ user.cpp:20:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[n+1][s[i]]++; ^ user.cpp:28:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i][s1[i]]=1; ^ user.cpp:31:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[n+1][s1[i]]++; ^ user.cpp:75:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr=nr+nrgr/2*a[ja][s[i]]; ^ user.cpp:79:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr=nr+nrgr/2*a[ja][s[i]]; ^ user.cpp:83:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr=nr+nrgr/2*b[jb][s1[i]]; ^ user.cpp:87:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr=nr+nrgr/2*b[jb][s1[i]]; ^ user.cpp:91:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%4==1) ^ user.cpp:131:23: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k%4==0) ^ user.cpp:88:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(nrgr%2!=0) ^