結果
| 問題 | No.1479 Matrix Eraser |
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-06-28 02:54:48 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 3,276 bytes |
| 記録 | |
| コンパイル時間 | 458 ms |
| コンパイル使用メモリ | 82,448 KB |
| 実行使用メモリ | 99,296 KB |
| 最終ジャッジ日時 | 2024-06-25 11:58:14 |
| 合計ジャッジ時間 | 6,323 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 5 TLE * 1 -- * 33 |
ソースコード
#!/usr/bin/env python3
# from typing import *
import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq
def input():
return sys.stdin.readline()[:-1]
sys.setrecursionlimit(1000000)
# _INPUT = """10 10
# 1 10 10 10 10 7 6 5 10 1
# 6 7 10 5 10 10 2 10 2 8
# 5 6 6 5 7 3 10 10 1 10
# 6 5 3 10 3 7 2 5 2 7
# 3 3 2 2 9 1 10 6 7 7
# 7 9 10 2 1 6 6 1 9 6
# 5 6 10 3 3 9 6 5 3 1
# 8 6 1 7 5 7 9 7 3 6
# 4 5 9 4 7 6 1 1 5 4
# 2 4 1 10 7 5 9 10 1 2
# """
# sys.stdin = io.StringIO(_INPUT)
class Dinic:
def __init__(self, n):
self.n = n
self.links = [[] for _ in range(n)]
self.depth = None
self.progress = None
def add_link(self, _from, to, cap):
self.links[_from].append([cap, to, len(self.links[to])])
self.links[to].append([0, _from, len(self.links[_from]) - 1])
def bfs(self, s):
depth = [-1] * self.n
depth[s] = 0
q = collections.deque([s])
while q:
v = q.popleft()
for cap, to, rev in self.links[v]:
if cap > 0 and depth[to] < 0:
depth[to] = depth[v] + 1
q.append(to)
self.depth = depth
def dfs(self, v, t, flow):
if v == t:
return flow
links_v = self.links[v]
for i in range(self.progress[v], len(links_v)):
self.progress[v] = i
cap, to, rev = link = links_v[i]
if cap == 0 or self.depth[v] >= self.depth[to]:
continue
d = self.dfs(to, t, min(flow, cap))
if d == 0:
continue
link[0] -= d
self.links[to][rev][0] += d
return d
return 0
def max_flow(self, s, t):
flow = 0
while True:
self.bfs(s)
if self.depth[t] < 0:
return flow
self.progress = [0] * self.n
current_flow = self.dfs(s, t, INF)
while current_flow > 0:
flow += current_flow
current_flow = self.dfs(s, t, INF)
INF = 10**10
def solve(Points):
h_list = sorted(list(set(h for (h, w) in Points)))
w_list = sorted(list(set(w for (h, w) in Points)))
h_dic = {a: i for i, a in enumerate(h_list)}
w_dic = {a: i for i, a in enumerate(w_list)}
h_count = len(h_list)
w_count = len(w_list)
mf = Dinic(h_count+w_count+2)
for i in range(h_count):
mf.add_link(0, i+1, 1)
for j in range(w_count):
mf.add_link(j+h_count+1, h_count+w_count+1, 1)
for h, w in Points:
h1 = h_dic[h]
w1 = w_dic[w]
mf.add_link(h1+1, w1+h_count+1, INF)
return mf.max_flow(0, h_count+w_count+1)
H, W = map(int, input().split())
A = [list(map(int, input().split())) for _ in range(H)]
n = 0
Done = [[(A[h][w] == 0) for w in range(W)] for h in range(H)]
for h in range(H):
for w in range(W):
if Done[h][w]:
continue
a = A[h][w]
Points = []
for h1 in range(H):
for w1 in range(W):
if A[h1][w1] == a:
Points.append((h1, w1))
Done[h1][w1] = True
n1 = solve(Points)
n += n1
print(n)