Compilare: user.cpp: In function ‘int Is_In_Hash(int)’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[x%MOD].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:47:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:49:75: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&Val[i]),v[i]=i,Add_To_Hash(Val[i],i),Max=max(Max,Val[i]); ^