Compilare: main.cpp: In function 'int main()': main.cpp:31:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if('a'<=s[j]&&s[j]<='z' || 'A'<=s[j]&&s[j]<='Z') ~~~~~~~~~^~~~~~~~~~~ main.cpp:35:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while('a'<=s[j]&&s[j]<='z' || 'A'<=s[j]&&s[j]<='Z') ~~~~~~~~~^~~~~~~~~~~ main.cpp:39:29: warning: array subscript has type 'char' [-Wchar-subscripts] a[t][a[t][0]]=s[j]; ^