方程格式是根据工艺过程确定的，请仔细阅读赛题描述给出的参考文献：
[1] A. M. Andrew, “LEVEL SET METHODS AND FAST MARCHING METHODS: EVOLVING INTERFACES IN COMPUTATIONAL GEOMETRY, FLUID MECHANICS, COMPUTER VISION, AND MATERIALS SCIENCE, by J.A. Sethian, Cambridge University Press, Cambridge, UK, 2nd edn. 1999 (first published 1996 as Level Set Methods) xviii + 420 pp., ISBN (paperback) 0-521-64557-3, (hardback) 0-521-64204-3,” Robotica, vol. 18, no. 1, pp. 89–92, 2000. doi:10.1017/S0263574799212404
[2] J. A. Sethian and D. Adalsteinsson, "An overview of level set methods for etching, deposition, and lithography development," in IEEE Transactions on Semiconductor Manufacturing, vol. 10, no. 1, pp. 167-184, Feb. 1997, doi: 10.1109/66.554505.
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