結果
問題 | No.622 点と三角柱の内外判定 |
ユーザー |
![]() |
提出日時 | 2025-03-20 21:11:06 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 37 ms / 1,500 ms |
コード長 | 1,730 bytes |
コンパイル時間 | 170 ms |
コンパイル使用メモリ | 82,444 KB |
実行使用メモリ | 53,988 KB |
最終ジャッジ日時 | 2025-03-20 21:11:20 |
合計ジャッジ時間 | 2,224 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
other | AC * 32 |
ソースコード
ax, ay, az = map(int, input().split()) bx, by, bz = map(int, input().split()) cx, cy, cz = map(int, input().split()) dx, dy, dz = map(int, input().split()) # Calculate vectors AB and AC ab = (bx - ax, by - ay, bz - az) ac = (cx - ax, cy - ay, cz - az) # Compute the normal vector (cross product AB x AC) n = ( ab[1] * ac[2] - ab[2] * ac[1], ab[2] * ac[0] - ab[0] * ac[2], ab[0] * ac[1] - ab[1] * ac[0] ) # Compute the projection of D onto the plane ABC denominator = n[0]**2 + n[1]**2 + n[2]**2 if denominator == 0: print("NO") exit() n_dot = n[0] * (ax - dx) + n[1] * (ay - dy) + n[2] * (az - dz) t = n_dot / denominator px = dx + t * n[0] py = dy + t * n[1] pz = dz + t * n[2] # Calculate vectors AP, AB, AC ap = (px - ax, py - ay, pz - az) ab = (bx - ax, by - ay, bz - az) ac_vec = (cx - ax, cy - ay, cz - az) # Determine the best pair of components to compute barycentric coordinates det_xy = ab[0] * ac_vec[1] - ab[1] * ac_vec[0] det_yz = ab[1] * ac_vec[2] - ab[2] * ac_vec[1] det_zx = ab[2] * ac_vec[0] - ab[0] * ac_vec[2] max_det = max(abs(det_xy), abs(det_yz), abs(det_zx)) if max_det == 0: print("NO") exit() if max_det == abs(det_xy): a = ab[0] b = ac_vec[0] c = ap[0] d = ab[1] e = ac_vec[1] f = ap[1] det = det_xy elif max_det == abs(det_yz): a = ab[1] b = ac_vec[1] c = ap[1] d = ab[2] e = ac_vec[2] f = ap[2] det = det_yz else: a = ab[2] b = ac_vec[2] c = ap[2] d = ab[0] e = ac_vec[0] f = ap[0] det = det_zx s = (e * c - b * f) / det t_val = (a * f - d * c) / det epsilon = 1e-10 if s >= -epsilon and t_val >= -epsilon and (s + t_val) <= 1.0 + epsilon: print("YES") else: print("NO")