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Create 12_guessNumHighLow.java #157

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Create 12_guessNumHighLow.java #157

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30 changes: 30 additions & 0 deletions 10 October LeetCode Challenge 2021/12_guessNumHighLow.java
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Original file line number Diff line number Diff line change
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/* The guess API is defined in the parent class GuessGame.
@param num, your guess
@return -1 if my number is lower, 1 if my number is higher, otherwise return 0
int guess(int num); */

public class Solution extends GuessGame {
public int guessNumber(int n) {
int low = 1;
int high = n;
while (low <= high) {
int mid1 = low + (high - low) / 3;
int mid2 = high - (high - low) / 3;
int res1 = guess(mid1);
int res2 = guess(mid2);
if (res1 == 0)
return mid1;
if (res2 == 0)
return mid2;
else if (res1 < 0)
high = mid1 - 1;
else if (res2 > 0)
low = mid2 + 1;
else {
low = mid1 + 1;
high = mid2 - 1;
}
}
return -1;
}
}