Compilare: user.c: In function ‘P2’: user.c:23:22: warning: argument to ‘sizeof’ in ‘memset’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset(c,0,sizeof(c)); ^ user.c: In function ‘main’: user.c:32:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ex.in","r",stdin),freopen("ex.out","w",stdout),scanf("%d%d%d",&n,&k,&p),r=p-k,s[1][1][1]=s[1][1][0]=c[0][0]=c[0][1]=y[0][1]=y[0][0]=1; ^ user.c:32:39: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ex.in","r",stdin),freopen("ex.out","w",stdout),scanf("%d%d%d",&n,&k,&p),r=p-k,s[1][1][1]=s[1][1][0]=c[0][0]=c[0][1]=y[0][1]=y[0][0]=1; ^ user.c:32:66: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("ex.in","r",stdin),freopen("ex.out","w",stdout),scanf("%d%d%d",&n,&k,&p),r=p-k,s[1][1][1]=s[1][1][0]=c[0][0]=c[0][1]=y[0][1]=y[0][0]=1; ^