C#•2y ago

❔ Two errors I cannot understand

I am trying to create a solution for this LC puzzle https://leetcode.com/problems/binary-tree-level-order-traversal/?envType=study-plan&id=level-1 My solution has a couple of errors like this;

public class Solution {
    public IList<IList<int>> LevelOrder(TreeNode root) {
        List<IList<int>> result = new();
        if(root == null){
            return result;
        }

        var q = new Queue<(int level, TreeNode node)>();
        var separation = new List<IList<int>>();

        q.Enqueue((0, root));
        while(q.Count > 0){
            var curr = q.Dequeue();
            if(separation.Count <= curr.level){
                separation.Add(new List<IList<int>>()); //ERROR 1
            }
            separation[curr.level].Add(curr.node.val);

            curr.level++;
            if(curr.node.left != null){
                q.Enqueue((level, curr.node.left)); // ERROR  2
            }

            if(curr.node.right != null){
                q.Enqueue((level, curr.node.right)); //ERROR 3
            }
            result.Add(separation); //ERROR 4
        }
        return result;

        
    }
}

public class Solution {
    public IList<IList<int>> LevelOrder(TreeNode root) {
        List<IList<int>> result = new();
        if(root == null){
            return result;
        }

        var q = new Queue<(int level, TreeNode node)>();
        var separation = new List<IList<int>>();

        q.Enqueue((0, root));
        while(q.Count > 0){
            var curr = q.Dequeue();
            if(separation.Count <= curr.level){
                separation.Add(new List<IList<int>>()); //ERROR 1
            }
            separation[curr.level].Add(curr.node.val);

            curr.level++;
            if(curr.node.left != null){
                q.Enqueue((level, curr.node.left)); // ERROR  2
            }

            if(curr.node.right != null){
                q.Enqueue((level, curr.node.right)); //ERROR 3
            }
            result.Add(separation); //ERROR 4
        }
        return result;

        
    }
}

` ERROR 1: Argument 1: cannot convert from 'System.Collections.Generic.List<System.Collections.Generic.IList<int>>' to 'System.Collections.Generic.IList<int>' ERRORS 2 & 3: The name 'level' does not exist in the current context (in Solution.cs) ERROR 4: Argument 1: cannot convert from 'System.Collections.Generic.List<System.Collections.Generic.IList<int>>' to 'System.Collections.Generic.IList<int>' (in Solution.cs) Could anyone kindly point me in the right direction?

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5 Replies

Angius•2y ago

Well, errors 1 and 4 are plenty clear Something expects an apple You're trying to cram a container of apples into it Square peg doesn't go into round hole 2 and 3 are quite clear as well There's no level wherever that error occurs You can't reference something that does not exist

MODiX•2y ago

you probably want $scopes

Angius•2y ago

$scopes

MODiX•2y ago

scope A {
  thing a;
  scope B {
    thing b;
  }
}

scope A {
  thing a;
  scope B {
    thing b;
  }
}

thing a is available in scope A and scope B thing b is available only in scope B

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Two errors I cannot understand