Compilare: user.cpp: In function ‘int main()’: user.cpp:37:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&p); ^ user.cpp:38:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(x=0;x<p;x++){fscanf(f,"%d%d",&i,&j);a[i][j]=-1;} ^ user.cpp:39:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d",&startx,&starty,&stopx,&stopy); ^