Multi-Agent Simulation (Boids)

题面

实现二维 Boids（群体）简化规则：对每个 agent，在半径 r 内取邻居平均速度做对齐更新 v_new = v + α (v_avg − v)，再 p_new = p + v_new。

Implementation Requirements

• Use only native features (external libraries are not permitted)
• The solve function signature must remain unchanged
• 结果写入 agents_next

Examples

见页面 N=2 示例（r=5.0，α=0.05）。

Constraints

• 1 ≤ N ≤ 100,000；位置/速度为 float32
• Performance: N = 10,000