Compilare: user.cpp: In function ‘int main()’: user.cpp:13:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++){ ^ user.cpp:8:24: warning: unused variable ‘ok2’ [-Wunused-variable] int n=0,k=0,i,top=-1,ok2=1,k2=0,a[101],ok=0,k3,b[100],max=0,zero=0; ^ user.cpp:8:42: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int n=0,k=0,i,top=-1,ok2=1,k2=0,a[101],ok=0,k3,b[100],max=0,zero=0; ^ user.cpp:8:63: warning: unused variable ‘zero’ [-Wunused-variable] int n=0,k=0,i,top=-1,ok2=1,k2=0,a[101],ok=0,k3,b[100],max=0,zero=0; ^