結果
| 問題 |
No.1997 X Lighting
|
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-03-26 15:50:26 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
AC
|
| 実行時間 | 283 ms / 2,000 ms |
| コード長 | 1,889 bytes |
| コンパイル時間 | 311 ms |
| コンパイル使用メモリ | 82,116 KB |
| 実行使用メモリ | 144,932 KB |
| 最終ジャッジ日時 | 2025-03-26 15:51:16 |
| 合計ジャッジ時間 | 6,429 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 30 |
ソースコード
import bisect
def main():
import sys
input = sys.stdin.read().split()
ptr = 0
N = int(input[ptr])
ptr += 1
M = int(input[ptr])
ptr += 1
D = set()
S = set()
buttons = []
for _ in range(M):
x = int(input[ptr])
y = int(input[ptr+1])
ptr +=2
d = x - y
s = x + y
D.add(d)
S.add(s)
buttons.append((d, s))
# Calculate A: sum of lengths for D
A = 0
for d in D:
A += N - abs(d)
# Calculate B: sum of lengths for S
B = 0
for s in S:
lower = max(1, s - N)
upper = min(N, s - 1)
if lower > upper:
continue
B += upper - lower + 1
# Preprocess D for C calculation
d_list = sorted(D)
# Prepare parity cumulative arrays
par0 = [0] * (len(d_list) + 1)
par1 = [0] * (len(d_list) + 1)
for i in range(len(d_list)):
d = d_list[i]
par0[i+1] = par0[i]
par1[i+1] = par1[i]
if d % 2 == 0:
par0[i+1] += 1
else:
par1[i+1] += 1
# Calculate C
C = 0
for s in S:
s_p = s % 2
# Compute d_min and d_max
d_min = max(2 - s, s - 2 * N)
d_max = min(2 * N - s, s - 2)
if d_min > d_max:
continue
# Find indices in d_list for [d_min, d_max]
left_idx = bisect.bisect_left(d_list, d_min)
right_idx = bisect.bisect_right(d_list, d_max) - 1
if left_idx > right_idx:
continue # no d in this range
# Calculate number of d with parity s_p in this range
if s_p == 0:
count = par0[right_idx + 1] - par0[left_idx]
else:
count = par1[right_idx + 1] - par1[left_idx]
C += count
print(A + B - C)
if __name__ == '__main__':
main()
lam6er