Compilare: user.cpp: In function ‘void fa(int)’: user.cpp:31:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i=0;i<=strlen(s);i++) ^ user.cpp:29:13: 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:68:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("senat.in","r",stdin); ^ user.cpp:69:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("senat.out","w",stdout); ^ user.cpp:70:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%d\n",&n,&m); ^ /tmp/cc7tbf30.o: In function `fa(int)': user.cpp:(.text+0x149): warning: the `gets' function is dangerous and should not be used.