Compilare: main.c: In function 'read': main.c:74:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&n,&m,&q); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:76:5: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(h[i]+1,nmax,stdin); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'query': main.c:154:5: 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:170:3: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(infile,"r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:171:3: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(outfile,"w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~