Dounx

def rollback(migrations_path)
  migrations_paths_was = ActiveRecord::Migrator.migrations_paths
  ActiveRecord::Migrator.migrations_paths = [migrations_path]
  ActiveRecord::Tasks::DatabaseTasks.check_target_version

  scope = ENV["SCOPE"]
  verbose_was, ActiveRecord::Migration.verbose = ActiveRecord::Migration.verbose, ActiveRecord::Tasks::DatabaseTasks.send(:verbose?)

  ActiveRecord::Base.connection.migration_context.down(ActiveRecord::Tasks::DatabaseTasks.target_version) do |migration|
    scope.blank? || scope == migration.scope

Dounx

type unionFind struct {
    parent []int
    rank []int
    boundedNode map[int] bool
}

func NewUnionFind(board [][]byte) *unionFind {
    m := len(board)
    n := len(board[0])
    

Dounx

{
  "name": "ant-design-pro",
  "version": "1.0.0",
  "private": true,
  "description": "An out-of-box UI solution for enterprise applications",
  "scripts": {
    "analyze": "cross-env ANALYZE=1 umi build",
    "build": "umi build",
    "deploy": "cross-env ANT_DESIGN_PRO_ONLY_DO_NOT_USE_IN_YOUR_PRODUCTION=site npm run site && npm run gh-pages",
    "fetch:blocks": "pro fetch-blocks",

Dounx

yarn upgrade v1.17.3
[1/5] Validating package.json...
[2/5] Resolving packages...
warning @ant-design/pro-layout > antd > rc-tree-select > rc-trigger > rc-animate > fbjs > core-js@1.2.7: core-js@<2.6.8 is no longer maintained. Please, upgrade to core-js@3 or at least to actual version of core-js@2.
warning dva > react-router-redux@5.0.0-alpha.9: This project is no longer maintained.
warning dva > dva-core > flatten@1.0.2: I wrote this module a very long time ago; you should use something else.
warning umi > umi-build-dev > umi-notify > is-ali-env > superagent@3.8.3: Please note that v5.0.1+ of superagent removes User-Agent header by default, therefore you may need to add it yourself (e.g. GitHub blocks requests without a User-Agent header).  This notice will go away with v5.0.2+ once it is released.
warning umi > umi-build-dev > umi-test > jest-cli > jest-config > jest-environment-jsdom > jsdom > left-pad@1.3.0: use String.prototype.padStart()
warning umi-plugin-react > umi-plugin-dva > dva > dva-core > flatt

Dounx

// s = "catsandog"
// wordDict = ["cats", "dog", "sand", "and", "cat"]
// dp[0] = "" => true
// dp[1] = "c" => false
// dp[2] = "ca" => false
// dp[3] = "cat" -> dp[0] && wordMap["cat"] => true
// dp[4] = "cats" -> dp[0] && wordMap["cats"] => true
// dp[5] = "catsa" => false
// dp[6] = "catsan" => false
// dp[7] = "catsand" -> dp[3] && wordMap["sand"] => true

Dounx

// [9,0,3,5,7]
// When num = 9, size = 16, i = 7, there will be a strange issue:
// ans[15][3] 7 -> 9
func subsets(nums []int) [][]int {
    sort.Ints(nums)
    
    // fmt.Println(nums)
    
    ans := make([][]int, 0)
    ans = append(ans, []int{})

Dounx

# s[i..j]
# dp[i][j] = (s[i] == s[j]) && (j - i <= 2 || dp[i + 1, j - 1])

# @param {String} s
# @return {String}
def longest_palindrome(s)
  return s if s.size <= 1
  
  longest_size = 1
  longest_s = s[0]