1462. Course Schedule IV

class Solution:
    def checkIfPrerequisite(
        self, n: int, prerequisites: List[List[int]], queries: List[List[int]]
    ) -> List[bool]:
        f = [[False] * n for _ in range(n)]
        g = [[] for _ in range(n)]
        indeg = [0] * n
        for a, b in prerequisites:
            g[a].append(b)
            indeg[b] += 1
        q = deque(i for i, x in enumerate(indeg) if x == 0)
        while q:
            i = q.popleft()
            for j in g[i]:
                f[i][j] = True
                for h in range(n):
                    f[h][j] = f[h][j] or f[h][i]
                indeg[j] -= 1
                if indeg[j] == 0:
                    q.append(j)
        return [f[a][b] for a, b in queries]