Compilare: main.c: In function 'main': main.c:11:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^~~~~~~~~~~~~~~~~~~ main.c:14:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&v[i]); ^~~~~~~~~~~~~~~~~~~~~~ main.c:36:5: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%d %d %d\n",mi,y+1,x+1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~