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("biti3.in","r",stdin),freopen("biti3.out","w",stdout),scanf("%lld%lld",&n,&m),c[0][0]=c[1][0]=c[1][1]=c[2][0]=c[2][2]=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("biti3.in","r",stdin),freopen("biti3.out","w",stdout),scanf("%lld%lld",&n,&m),c[0][0]=c[1][0]=c[1][1]=c[2][0]=c[2][2]=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:67: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("biti3.in","r",stdin),freopen("biti3.out","w",stdout),scanf("%lld%lld",&n,&m),c[0][0]=c[1][0]=c[1][1]=c[2][0]=c[2][2]=1; ^~~~~~~~~~~~~~~~~~~~~~~