Compilare: user.cpp: In function ‘int main()’: user.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(sir1);i++){ ^ user.cpp:18:56: warning: unused variable ‘sw’ [-Wunused-variable] sort(a1,a1+25,cmp);sort(a2,a2+25,cmp);i=0;bool sw=0; ^ /tmp/ccKN7FzX.o: In function `main': user.cpp:(.text.startup+0x7a): warning: the `gets' function is dangerous and should not be used.