結果
| 問題 | No.165 四角で囲え! |
| コンテスト | |
| ユーザー |
norioc
|
| 提出日時 | 2025-03-19 20:31:27 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 3,132 ms / 5,000 ms |
| コード長 | 3,100 bytes |
| コンパイル時間 | 404 ms |
| コンパイル使用メモリ | 82,192 KB |
| 実行使用メモリ | 88,444 KB |
| 最終ジャッジ日時 | 2025-03-19 20:31:58 |
| 合計ジャッジ時間 | 26,183 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 19 |
ソースコード
import sys
input = sys.stdin.readline
def cumsum2(a: list[list]):
rows = len(a)
cols = len(a[0])
t = [[0] * cols for _ in range(rows)]
for i in range(rows):
for j in range(cols):
t[i][j] = a[i][j]
if i > 0: t[i][j] += t[i-1][j]
if j > 0: t[i][j] += t[i][j-1]
if i > 0 and j > 0: t[i][j] -= t[i-1][j-1]
def f(sr, sc, tr, tc):
s = t[tr][tc]
if sr > 0: s -= t[sr-1][tc]
if sc > 0: s -= t[tr][sc-1]
if sr > 0 and sc > 0: s += t[sr-1][sc-1]
return s
return f
class Compression:
def __init__(self, iterable):
self.vs = sorted(set(iterable))
self.n = len(self.vs)
self.v2i = {}
for i, val in enumerate(self.vs):
self.v2i[val] = i
def __len__(self):
return self.n
def index(self, val):
"""val のインデックスを返す"""
return self.v2i[val]
def value(self, index):
"""インデックスに対応する値を返す"""
return self.vs[index]
from collections import defaultdict
from itertools import accumulate, combinations
def accum(a: list):
acc = list(accumulate(a))
return lambda l, r: acc[r] - (acc[l-1] if l > 0 else 0)
def shakutori(a: list, can_expand, expand, shrink, identity):
n = len(a)
res = identity()
hi = -1
for lo in range(n):
if lo > hi:
hi = lo - 1
res = identity()
# 必要な分だけ伸ばす
while hi+1 < n and can_expand(res, a[hi+1]):
res = expand(res, a[hi+1])
hi += 1
if lo <= hi:
yield res, lo, hi
res = shrink(res, a[lo]) # lo をひとつ進める
# res に x を追加できるか
def can_expand(res, x):
return res+x <= B
# 伸ばす(res に x を追加)
def expand(res, x):
return res+x
# 縮める(res から x を削除)
def shrink(res, x):
return res-x
N, B = map(int, input().split())
ps = []
xset = set()
yset = set()
for _ in range(N):
X, Y, P = map(int, input().split())
ps.append((X, Y, P))
xset.add(X)
yset.add(Y)
xcomp = Compression(xset)
ycomp = Compression(yset)
xmax = max([xcomp.index(x) for x in xset])
ymax = max([ycomp.index(y) for y in yset])
g = [[0] * (xmax+1) for _ in range(ymax+1)]
t = [[0] * (xmax+1) for _ in range(ymax+1)]
for x, y, p in ps:
cx = xcomp.index(x)
cy = ycomp.index(y)
g[cy][cx] += p
t[cy][cx] += 1
acc_g = cumsum2(g)
acc_t = cumsum2(t)
def calc(lx: int, rx: int) -> int:
scores = [0] * (ymax+1)
pts = [0] * (ymax+1)
for y in range(ymax+1):
scores[y] = acc_g(y, lx, y, rx)
pts[y] = acc_t(y, lx, y, rx)
acc_pts = accum(pts)
res = 0
for _, lo, hi in shakutori(scores, can_expand, expand, shrink, int):
res = max(res, acc_pts(lo, hi))
return res
ans = 0
xkeys = sorted([xcomp.index(x) for x in xset])
for i in range(len(xkeys)):
for j in range(i, len(xkeys)):
l = xkeys[i]
r = xkeys[j]
ans = max(ans, calc(l, r))
print(ans)
norioc