Compilare: main.cpp: In function 'int main()': main.cpp:16:15: warning: array subscript has type 'char' [-Wchar-subscripts] 16 | f[s[i]]=i; | ^ main.cpp:24:28: warning: array subscript has type 'char' [-Wchar-subscripts] 24 | nr=nr*10+f[s[i]]; | ^ main.cpp:11:18: warning: unused variable 'a' [-Wunused-variable] 11 | int nr, k=0, a; | ^