Compilare: main.c: In function 'main': main.c:5:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pluricex.in","r",stdin),freopen("pluricex.out","w",stdout),scanf("%d%d%d",&n,&k,&d); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:38: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pluricex.in","r",stdin),freopen("pluricex.out","w",stdout),scanf("%d%d%d",&n,&k,&d); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:73: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("pluricex.in","r",stdin),freopen("pluricex.out","w",stdout),scanf("%d%d%d",&n,&k,&d); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a); ^~~~~~~~~~~~~~ main.c:9:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&j),b[i][j]=1; ^~~~~~~~~~~~~~