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    if([[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPad){
        if (@available(iOS 11, *)) {
            self.accountTableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        }
        else {
            self.accountTableView.contentInset = UIEdgeInsetsMake(-64, 0, 0, 0);
        }
    }

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// binary tree to undirected graph
// treeToGraph(null, root);
public void treeToGraph(TreeNode parent, TreeNode child) {
    if (parent != null) {
        List<TreeNode> pNeighbors = g.getOrDefault(parent, new ArrayList<TreeNode>());
        pNeighbors.add(child);
        g.put(parent, pNeighbors);

        List<TreeNode> cNeighbors = g.getOrDefault(child, new ArrayList<TreeNode>());
        cNeighbors.add(parent);

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Tree

Path

543 Diameter of Binary Tree
687 Longest Univalue Path
863 All Nodes distance K in Binary Tree

Tree -> Undirected Graph BFS Graph find distance k

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// 2 union find, better for checking connected components in dymanic graph
public int findCircleNum(int[][] M) {
    int[] id = new int[M.length];
    for (int i = 0; i < id.length; i++) id[i] = i;

    int[] count = new int[1];
    count[0] = id.length;
    for (int i = 0; i < M.length; i++) {
        for (int j = i; j < M[0].length; j++) {
            if (M[i][j] == 1 && i != j) union(i, j, count, id);

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// Lt547 friend circle

// 1 dfs, better for checking connected components in static graph
public int findCircleNum(int[][] M) {
    if (M.length == 0 || M[0].length == 0) return 0;
    int m = M.length;
    int n = M[0].length;
    boolean[] visited = new boolean[m];
    int ans = 0;
    for (int i = 0; i < m; i++) {

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// if the device is running Android 6.0 (API level 23) 
// and the app's targetSdkVersion is 23 or higher, 

//the following system behavior applies when your app requests a dangerous permission:
// 1.
//If the app doesn't currently have any permissions in the permission group, 
//the system shows the permission request dialog to the user describing the permission group 
//that the app wants access to. The dialog doesn't describe the specific permission within 
//that group. For example, if an app requests the READ_CONTACTS permission, 
//the system dialog just says the app needs access to the device's contacts. 

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/**
 * Code shared by String and StringBuffer to do searches. The
 * source is the character array being searched, and the target
 * is the string being searched for.
 *
 * @param   source       the characters being searched.
 * @param   sourceOffset offset of the source string.
 * @param   sourceCount  count of the source string.
 * @param   target       the characters being searched for.
 * @param   targetOffset offset of the target string.

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// check permissions
private void requestForGpsPermission() {
    if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this,
        new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
        REQUEST_ACCESS_FINE_LOCATION);

  }
}

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// Delay 2 seconds 
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(2)) {
   // Your code with delay
}

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/*
 * Copyright (C) 2014 skyfish.jy@gmail.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software