delete pics to save space

1.1137.cpp

@@ -0,0 +1,42 @@
+#include<cstdio>
+#include<algorithm>
+#include<vector>
+#include<stack>
+#include<cassert>
+using namespace std;
+const int maxn=100005;
+int n,m,f[maxn];
+vector<int> G[maxn];
+int in[maxn],tp[maxn],cnt;
+stack<int> stk;
+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[x].push_back(y); in[y]++;
+	}
+	for(int i=1;i<=n;i++) if(in[i]==0) { tp[++cnt]=i; stk.push(i); }
+	while(stk.size())
+	{
+		int u=stk.top(); stk.pop();
+		for(int v:G[u])
+		{
+			in[v]--;
+			if(!in[v]) { tp[++cnt]=v; stk.push(v); }
+		}
+	}
+	for(int i=1;i<=n;i++) f[i]=1;
+	assert(cnt==n);
+	for(int i=1;i<=n;i++)
+	{
+		int u=tp[i];
+		for(int v:G[u]) f[v]=max(f[v],f[u]+1);
+	}
+	for(int i=1;i<=n;i++) printf("%d\n",f[i]);
+	return 0;
+}