Compilare: user.cpp: In function ‘void cit()’: user.cpp:45:17: warning: NULL used in arithmetic [-Wpointer-arith] while(s[i]!=NULL){ ^ user.cpp: In function ‘int main()’: user.cpp:87:21: warning: NULL used in arithmetic [-Wpointer-arith] while(s[j]!=NULL){ ^ user.cpp: In function ‘void cit()’: user.cpp:44:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp: In function ‘int main()’: user.cpp:60:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("stramosi.in","r",stdin); ^ user.cpp:61:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("stramosi.out","w",stdout); ^ user.cpp:64:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d\n",&n,&m); ^ user.cpp:80:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccmi6kwV.o: In function `cit()': user.cpp:(.text+0x125): warning: the `gets' function is dangerous and should not be used.