Compilare: main.c: In function 'read': main.c:79:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&n,&m,&q); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:81:3: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(h[i]+1,nmax,stdin); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'solve': main.c:125:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n",&x1,&y1,&x2,&y2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'main': main.c:132:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(infile,"r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:133:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(outfile,"w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~