Compilare: user.cpp: In function ‘int contor(char*, char*)’: user.cpp:11:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<strlen(s1);k++) ^ user.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c==strlen(s1)) return 1; ^ user.cpp: In function ‘int main()’: user.cpp:21:15: warning: unused variable ‘j’ [-Wunused-variable] int i=0,n,j; ^