Minimum Number of Vertices to Reach All Nodes

export function findSmallestSetOfVertices(n: number, edges: number[][]): number[] {
  const indegrees = new Array(n).fill(0);
 
  for (const [, to] of edges) {
    indegrees[to] += 1;
  }
 
  const answer: number[] = [];
  indegrees.forEach((indegree, i) => {
    if (indegree === 0) {
      answer.push(i);
    }
  });
 
  return answer;
}