Developer solves CSES Number Spiral problem in Rust using O(1) pattern logic

A developer shared a Rust-based solution to the CSES 'Number Spiral' problem, where coordinates x and y can reach up to 10^9, making brute-force spiral construction impractical. The approach relies on recognizing that the value at any position (x, y) exceeds the square of one less than the larger of the two coordinates. From there, four cases based on which coordinate is larger and the parity of the squared value determine the final answer. The solution runs in constant O(1) time using a concise helper function. The full implementation, including standard input parsing for multiple test cases, was published on DEV Community as part of an ongoing series on solving CSES problems in Rust.