結果
| 問題 | No.1669 パズル作成 |
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-04-09 21:04:45 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 2,900 bytes |
| 記録 | |
| コンパイル時間 | 224 ms |
| コンパイル使用メモリ | 82,596 KB |
| 実行使用メモリ | 109,108 KB |
| 最終ジャッジ日時 | 2025-04-09 21:06:22 |
| 合計ジャッジ時間 | 5,192 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 13 WA * 16 |
ソースコード
import sys
from collections import defaultdict
class PotentialUnionFind:
def __init__(self, size):
self.parent = list(range(size))
self.rank = [0] * size
self.delta = [0] * size # delta[i] is the XOR difference between i and parent[i]
def find(self, x):
if self.parent[x] == x:
return x
orig_parent = self.parent[x]
self.parent[x] = self.find(orig_parent)
self.delta[x] ^= self.delta[orig_parent]
return self.parent[x]
def unite(self, x, y, w):
rx = self.find(x)
ry = self.find(y)
if rx == ry:
if (self.delta[x] ^ self.delta[y]) != w:
return False
return True
if self.rank[rx] < self.rank[ry]:
rx, ry = ry, rx
x, y = y, x
w ^= self.delta[x] ^ self.delta[y]
self.parent[ry] = rx
self.delta[ry] = self.delta[y] ^ w ^ self.delta[x]
if self.rank[rx] == self.rank[ry]:
self.rank[rx] += 1
return True
def main():
input = sys.stdin.read().split()
ptr = 0
N = int(input[ptr])
ptr += 1
M = int(input[ptr])
ptr += 1
blacks = []
for _ in range(M):
r = int(input[ptr]) - 1
ptr += 1
c = int(input[ptr]) - 1
ptr += 1
blacks.append((r, c))
uf = PotentialUnionFind(2 * N)
conflict = False
for r, c in blacks:
row_node = r
col_node = N + c
if not uf.unite(row_node, col_node, 0):
conflict = True
break
if conflict:
print(N * N - M)
return
component_info = defaultdict(lambda: {'rows': 0, 'cols': 0, 'black_count': 0})
for r in range(N):
root = uf.find(r)
component_info[root]['rows'] += 1
for c in range(N):
col_node = N + c
root = uf.find(col_node)
component_info[root]['cols'] += 1
for r, c in blacks:
row_node = r
col_node = N + c
root = uf.find(row_node)
component_info[root]['black_count'] += 1
constant_part = 0
components = []
for key in component_info:
ci = component_info[key]
a = ci['rows']
b = ci['cols']
black = ci['black_count']
constant_part += a * b - black
components.append((a, b))
components.sort(key=lambda x: -(x[0] + x[1]))
total0_row, total0_col = 0, 0
total1_row, total1_col = 0, 0
loss = 0
for a, b in components:
loss0 = a * total0_col + b * total0_row
loss1 = a * total1_col + b * total1_row
if loss0 <= loss1:
loss += loss0
total0_row += a
total0_col += b
else:
loss += loss1
total1_row += a
total1_col += b
total = constant_part + loss
print(total)
if __name__ == '__main__':
main()
lam6er