Compilare: user.cpp: In function ‘int main()’: user.cpp:19:16: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>s[i]+1; ^ user.cpp:29:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[s[i][j]]+=1; ^ user.cpp:34:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] act[c[s[i][v[j]]]]=v[j]; ^ user.cpp:35:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[s[i][v[j]]]-=1; ^