Problem:
Score : 100 points

Problem Statement

There is a directed graph G with N vertices and M edges.
The vertices are numbered 1, 2, \ldots, N, and for each i (1 \leq i \leq M), the i-th directed edge goes from Vertex x_i to y_i.
G does not contain directed cycles.

Find the length of the longest directed path in G.
Here, the length of a directed path is the number of edges in it.

Constraints

All values in input are integers.

2 \leq N \leq 10^5

1 \leq M \leq 10^5

1 \leq x_i, y_i \leq N

All pairs (x_i, y_i) are distinct.

G does not contain directed cycles.

Input

Input is given from Standard Input in the following format:

N M
x_1 y_1
x_2 y_2
:
x_M y_M

Output

Print the length of the longest directed path in G.

Sample Input 1

4 5
1 2
1 3
3 2
2 4
3 4

Sample Output 1

3

The red directed path in the following figure is the longest:

Sample Input 2

6 3
2 3
4 5
5 6

Sample Output 2

2

The red directed path in the following figure is the longest:

Sample Input 3

5 8
5 3
2 3
2 4
5 2
5 1
1 4
4 3
1 3

Sample Output 3

3

The red directed path in the following figure is one of the longest:

Solution in Python (3.8.2) (judge verdict: Accepted)

from sys import setrecursionlimit
setrecursionlimit(10**7)

N, M = map(int, input().split())
graph = [[] for _ in range(N)]
for _ in range(M):
  x, y = map(lambda x: int(x)-1, input().split())
  graph[x].append(y)

dp = [-1]*N
def rec(v):
  if dp[v] != -1:
    return dp[v]
  
  res = 0
  for nv in graph[v]:
    res = max(res, rec(nv)+1)
  dp[v] = res
  return res

res = 0
for v in range(N):
  res = max(res, rec(v))
print(res)