poj1236/luogu2746 Network of schools (Tarjan)

After Tarjan, the first question is clearly the number of points with zero degrees.
Second question: Considering that there is no degree of penetration or 0 of the point of the graph strong connectivity,
So the answer is that the number of zero in the max{, the number of zero in the degree}
(The zero-out point is connected to zero, then the remaining zero is a random connection)

1#include <cstdio>2#include <cstring>3#include <algorithm>4 #defineLL Long Long int5 using namespacestd;6 Const intmaxn= the, maxm=10010;7 8 LL Rd () {9LL x=0;CharC=getchar ();intneg=1;Ten      while(c<'0'|| C>'9'){if(c=='-') neg=-1; c=GetChar ();} One      while(c>='0'&&c<='9') x=x*Ten+c-'0', c=GetChar (); A     returnx*neg; - } -  the intN; - integ[maxm][2],EGH[MAXN],ECT,BEL[MAXN]; - intDFN[MAXN],LOW[MAXN],STK[MAXN],TOT,PCT,SCT; - inttin,tout; + BOOLINSTK[MAXN],inch[MAXN], out[MAXN]; -  + voidTarjan (intx) { Adfn[x]=low[x]=++tot;stk[++sct]=x;instk[x]=1; at      for(inti=egh[x];i!=-1; i=eg[i][1]){ -         intj=eg[i][0]; -         if(Instk[j]) low[x]=min (low[x],dfn[j]); -         Else if(!Dfn[j]) { -Tarjan (j); low[x]=min (low[x],low[j]); -         } in     } -     if(dfn[x]==Low[x]) { topct++; +          while(SCT) { -instk[stk[sct]]=0; thebel[stk[sct]]=pct; *             if(stk[sct--]==x) Break; $         }Panax Notoginseng     } - } the  +InlinevoidAdeg (intAintb) { Aeg[ect][0]=b;eg[ect][1]=egh[a];egh[a]=ect++; the } +  - intMain () { $     inti,j,k; $N=rd (); Memset (egh,-1,sizeof(Egh)); -      for(i=1; i<=n;i++){ -          while(j=Rd ()) adeg (i,j); the     } -      for(i=1; i<=n;i++){Wuyi         if(!Dfn[i]) Tarjan (i); the     } -      for(i=1; i<=n;i++){ Wu          for(j=egh[i];j!=-1; j=eg[j][1]){ -k=eg[j][0]; About             intii=bel[i],kk=Bel[k]; $             if(ii!=KK) { -                 inch[kk]=1; out[ii]=1; -             } -         } A} for(i=1; i<=pct;i++){ +         if(!inch[i]) tin++; the         if(! out[i]) tout++; -     } $     if(pct>1) printf ("%d\n%d", Tin,max (tin,tout)); the     Elseprintf"1\n0"); the      the}

poj1236/luogu2746 Network of schools (Tarjan)