Compilare: main.c: In function 'main': main.c:26:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri3.in","r",stdin),freopen("drumuri3.out","w",stdout),scanf("%d%d%d%d",&n,&m,&k,&q),--k; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:26:38: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri3.in","r",stdin),freopen("drumuri3.out","w",stdout),scanf("%d%d%d%d",&n,&m,&k,&q),--k; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:26:73: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri3.in","r",stdin),freopen("drumuri3.out","w",stdout),scanf("%d%d%d%d",&n,&m,&k,&q),--k; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:28:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),a[i][j]=a[j][i]=1; ^~~~~~~~~~~~~~~~~~~ main.c:39:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),printf("%d\n",b[i][j]); ^~~~~~~~~~~~~~~~~~~