#649903 (Crystal) No.1479 Matrix Eraser

提出ソース

結果

問題	No.1479 Matrix Eraser
ユーザー	yuruhiya
提出日時	2021-04-20 18:01:48
言語	Crystal (1.11.2)
結果	AC
実行時間	301 ms / 3,000 ms
コード長	3,981 bytes
コンパイル時間	17,953 ms
コンパイル使用メモリ	259,792 KB
実行使用メモリ	57,400 KB
最終ジャッジ日時	2023-09-17 08:51:26
合計ジャッジ時間	25,215 ms
ジャッジサーバーID （参考情報）	judge13 / judge14

このコードへのチャレンジ
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テストケース

テストケース表示

入力	結果	実行時間実行使用メモリ
testcase_00	AC	2 ms 4,452 KB
testcase_01	AC	2 ms 4,404 KB
testcase_02	AC	2 ms 4,636 KB
testcase_03	AC	3 ms 4,532 KB
testcase_04	AC	3 ms 4,540 KB
testcase_05	AC	3 ms 4,492 KB
testcase_06	AC	2 ms 4,476 KB
testcase_07	AC	27 ms 11,116 KB
testcase_08	AC	49 ms 16,784 KB
testcase_09	AC	119 ms 28,756 KB
testcase_10	AC	239 ms 57,384 KB
testcase_11	AC	151 ms 30,976 KB
testcase_12	AC	34 ms 15,124 KB
testcase_13	AC	48 ms 17,180 KB
testcase_14	AC	37 ms 15,152 KB
testcase_15	AC	10 ms 7,452 KB
testcase_16	AC	42 ms 16,428 KB
testcase_17	AC	295 ms 57,188 KB
testcase_18	AC	301 ms 57,144 KB
testcase_19	AC	289 ms 57,304 KB
testcase_20	AC	291 ms 57,252 KB
testcase_21	AC	290 ms 57,064 KB
testcase_22	AC	301 ms 57,396 KB
testcase_23	AC	295 ms 57,252 KB
testcase_24	AC	301 ms 57,248 KB
testcase_25	AC	296 ms 57,376 KB
testcase_26	AC	299 ms 57,388 KB
testcase_27	AC	165 ms 30,936 KB
testcase_28	AC	165 ms 30,936 KB
testcase_29	AC	161 ms 30,884 KB
testcase_30	AC	168 ms 30,884 KB
testcase_31	AC	158 ms 30,852 KB
testcase_32	AC	66 ms 29,872 KB
testcase_33	AC	66 ms 29,676 KB
testcase_34	AC	66 ms 29,532 KB
testcase_35	AC	67 ms 30,212 KB
testcase_36	AC	67 ms 31,072 KB
testcase_37	AC	51 ms 27,184 KB
testcase_38	AC	168 ms 40,604 KB
testcase_39	AC	245 ms 57,400 KB
testcase_40	AC	2 ms 4,436 KB

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コンパイルメッセージ

In Main.cr:163:15

 163 | edges = Array.product((0...h).to_a, (0...w).to_a).group_by { |(i, j)|
                     ^------
Warning: Deprecated Array(T).product. Use `Indexable.cartesian_product(indexables : Indexable(Indexable))` instead

A total of 1 warnings were found.

ソースコード

raw source code

# require "template"
lib C
  fun strtoll(s : UInt8*, p : UInt8**, b : Int32) : Int64
end

class String
  def to_i64
    C.strtoll(self, nil, 10)
  end
end
# require "graph/bipartite_matching"
# require "./graph"
struct Edge(T)
  property to : Int32
  property cost : T

  def initialize(@to : Int32, @cost : T)
  end

  def to_s(io) : Nil
    io << {to, cost}
  end

  def inspect(io) : Nil
    io << "->#{to}(#{cost})"
  end
end

struct Edge2(T)
  property from : Int32
  property to : Int32
  property cost : T

  def initialize(@from : Int32, @to : Int32, @cost : T)
  end

  def reverse
    Edge2(T).new(to, from, cost)
  end

  def to_s(io) : Nil
    io << {from, to, cost}
  end

  def inspect(io) : Nil
    io << "#{from}->#{to}(#{cost})"
  end
end

class Graph(T)
  getter size : Int32
  getter graph : Array(Array(Edge(T)))

  def initialize(@size : Int32)
    raise ArgumentError.new("Negative graph size: #{size}") unless size >= 0
    @graph = Array.new(size) { Array(Edge(T)).new }
  end

  def initialize(@size, edges : Array(Edge2(T)), undirected : Bool)
    raise ArgumentError.new("Negative graph size: #{size}") unless size >= 0
    @graph = Array.new(size) { Array(Edge(T)).new }
    edges.each do |edge|
      @graph[edge.from] << Edge.new(edge.to, edge.cost)
      @graph[edge.to] << Edge.new(edge.from, edge.cost) if undirected
    end
  end

  def add_edge(i : Int32, j : Int32, cost : T)
    raise IndexError.new unless 0 <= i < size
    raise IndexError.new unless 0 <= j < size
    graph[i] << Edge(T).new(j, cost)
    graph[j] << Edge(T).new(i, cost)
  end

  def add_edge_directed(i : Int32, j : Int32, cost : T)
    raise IndexError.new unless 0 <= i < size
    raise IndexError.new unless 0 <= j < size
    graph[i] << Edge(T).new(j, cost)
  end

  def [](i : Int32)
    graph[i]
  end

  def each_edge : Nil
    (0...size).each do |v|
      graph[v].each do |edge|
        yield Edge2(T).new(v, edge.to, edge.cost)
      end
    end
  end

  def edges : Array(Edge2(T))
    result = [] of Edge2(T)
    each_edge do |edge|
      result << edge
    end
    result
  end
end

class BipartiteMatching
  getter left : Int32
  getter right : Int32
  getter graph : Graph(Nil)

  def initialize(@left, @right)
    raise ArgumentError.new "Negative left vertexes size: #{left}" unless left >= 0
    raise ArgumentError.new "Negative right vertexes size: #{right}" unless right >= 0
    @graph = Graph(Nil).new(left)
    @left_match = Array(Int32).new(left, -1)
    @right_match = Array(Int32).new(right, -1)
    @used = Array(Bool).new(left, false)
  end

  def add_edge(l : Int32, r : Int32)
    raise IndexError.new unless 0 <= l < left
    raise IndexError.new unless 0 <= r < right
    graph[l] << Edge.new(r, nil)
    self
  end

  def add_edge(edges : Array(Edge2(Nil)))
    edges.each do |edge|
      add_edge(edge.from, edge.to)
    end
    self
  end

  private def dfs(v : Int32) : Bool
    return false if @used[v]
    @used[v] = true
    graph[v].each do |edge|
      if @right_match[edge.to] == -1 || dfs(@right_match[edge.to])
        @left_match[v], @right_match[edge.to] = edge.to, v
        return true
      end
    end
    return false
  end

  def solve : Int32
    result = 0
    loop do
      update = false
      (0...left).each do |i|
        if @left_match[i] == -1 && dfs(i)
          update = true
          result += 1
        end
      end
      break unless update
      @used.fill(false)
    end
    result
  end
end

h, w = read_line.split.map(&.to_i)
a = (1..h).map { read_line.split.map(&.to_i) }

l, r = 0, 0
edges = Array.product((0...h).to_a, (0...w).to_a).group_by { |(i, j)|
  a[i][j]
}.flat_map { |val, points|
  next [] of Edge2(Nil) if val == 0
  row = {} of Int32 => Int32
  column = {} of Int32 => Int32
  points.map do |(y, x)|
    ll = row[y]? || (row[y] = (l += 1) - 1)
    rr = column[x]? || (column[x] = (r += 1) - 1)
    Edge2.new(ll, rr, nil)
  end
}

puts BipartiteMatching.new(l, r).add_edge(edges).solve

yukicoder

結果

テストケース

コンパイルメッセージ

ソースコード