Compilare: user.cpp: In function ‘int main()’: user.cpp:33:28: 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:36:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&x,&y); ^ user.cpp:55:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&tx,&ty); ^ user.cpp: In function ‘int Search(int*, int)’: user.cpp:28:12: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^ user.cpp: In function ‘int main()’: user.cpp:58:23: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] Px=Search(X,x); ^ user.cpp:60:54: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] Ans=(1LL*(2*Px-N)*x+SumX[N]-2*SumX[Px]+1LL*(2*Py-N)*y+SumY[N]-2*SumY[Py])/2; ^