Compilare: user.cpp: In function ‘int main()’: user.cpp:67:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] else rs[++cnt] = '0', u[s[i]] = 0, poz[cnt] = s[i]; ^ user.cpp:73:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[c] = !u[c]; ^ user.cpp:73:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[c] = !u[c]; ^ user.cpp:75:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (poz[i] == c) rs[i] = u[c] + '0'; ^ user.cpp: In function ‘bool fac(int)’: user.cpp:25:12: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] return r; ^