Compilare: user.cpp: In function ‘void Query(int, int, int)’: user.cpp:44:13: warning: NULL used in arithmetic [-Wpointer-arith] if(Ans.v==NULL&&Ans.hi==NULL&&Ans.lw==NULL) ^ user.cpp:44:27: warning: NULL used in arithmetic [-Wpointer-arith] if(Ans.v==NULL&&Ans.hi==NULL&&Ans.lw==NULL) ^ user.cpp:44:41: warning: NULL used in arithmetic [-Wpointer-arith] if(Ans.v==NULL&&Ans.hi==NULL&&Ans.lw==NULL) ^ user.cpp: In function ‘int main()’: user.cpp:91:22: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] Ans.v=Ans.hi=Ans.lw=NULL; ^ user.cpp:71:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&N,&M); ^ user.cpp:74:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&v[i]),Sum[i]=Sum[i-1]+v[i]; ^ user.cpp:90:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&Start,&End); ^