The "Four Corners" region of the US is where Colorado, Utah, Arizona, and New Mexico all meet - the only place where four states touch. The Four Corners Monument itself is on Navajo land.
Given coordinates x and y, return one of five strings:
  • If and , then return "NN"
  • Otherwise, if x & y are both positive, return "CO",
  • if x is negative and y is positive, return "UT",
  • if x & y are both negative, return "AZ",
  • if x is positive and y is negative, return "NM"
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刘庆伟 Samuel Lorenzo Dinesh

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