delete pics to save space

p.CH2101.cpp

@@ -0,0 +1,41 @@
+//http://contest-hunter.org:83/contest/0x20%E3%80%8C%E6%90%9C%E7%B4%A2%E3%80%8D%E4%BE%8B%E9%A2%98/2101%20%E5%8F%AF%E8%BE%BE%E6%80%A7%E7%BB%9F%E8%AE%A1
+#include<cstdio>
+#include<bitset>
+#include<stack>
+#include<vector>
+using namespace std;
+const int maxn=30005;
+int n,m,d[maxn],rk[maxn],cnt;
+vector<int> G[maxn];
+bitset<maxn> f[maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d",&n,&m);
+	for(int i=0;i<m;i++)
+	{
+		int x,y; scanf("%d%d",&x,&y);
+		G[y].push_back(x); d[x]++;
+	}
+	stack<int> stk;
+	for(int i=1;i<=n;i++) if(d[i]==0) stk.push(i);
+	while(stk.size())
+	{
+		int u=stk.top(); stk.pop(); rk[cnt++]=u;
+		for(int v:G[u])
+		{
+			d[v]--;
+			if(!d[v]) stk.push(v);
+		}
+	}
+	for(int i=1;i<=n;i++) f[i][i-1]=1;
+	for(int i=0;i<n;i++)
+	{
+		int u=rk[i];
+		for(int v:G[u]) f[v]|=f[u];
+	}
+	for(int i=1;i<=n;i++) printf("%d\n",f[i].count());
+	return 0;
+}