22 lines
638 B
Rust
22 lines
638 B
Rust
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/**
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* Forward declaration of guess API.
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* @param num your guess
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* @return -1 if num is higher than the picked number
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* 1 if num is lower than the picked number
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* otherwise return 0
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* unsafe fn guess(num: i32) -> i32 {}
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*/
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impl Solution {
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unsafe fn guessNumber(n: i32) -> i32 {
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let (mut min, mut max) = (1, n);
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while min != max {
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let guess_num = max / 2 + min / 2;
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match guess(guess_num) {
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-1 => max = guess_num - 1,
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1 => min = guess_num + 1,
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_ => return guess_num
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}
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}
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min
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}
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}
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