Compilare: user.cpp: In function ‘int main()’: user.cpp:42:24: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if ((i>>j)&1==1) uhash[i-put2[j]]=1; ^ user.cpp:25:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dinti.in","r",stdin); ^ user.cpp:26:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dinti.out","w",stdout); ^ user.cpp:27:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&k); gets(s); ^ user.cpp:27:36: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&k); gets(s); ^ user.cpp:28:10: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); curent=0; put2[0]=1; ^ user.cpp:45:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); curent=0; ^ /tmp/cc2kgKT3.o: In function `main': user.cpp:(.text.startup+0x7a): warning: the `gets' function is dangerous and should not be used.