Compilare: main.c: In function 'main': main.c:5:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("homm.in","r",stdin),freopen("homm.out","w",stdout),scanf("%d%d%d",&m,&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:31: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("homm.in","r",stdin),freopen("homm.out","w",stdout),scanf("%d%d%d",&m,&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:62: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("homm.in","r",stdin),freopen("homm.out","w",stdout),scanf("%d%d%d",&m,&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:8:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b[i][j]); ^~~~~~~~~~~~~~~~~~~~ main.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&x,&y,&z,&t),a[0][x][y]=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~