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LeetCode_00081.java
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32 lines (30 loc) · 1.03 KB
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package com.github.jerring.leetcode;
public class LeetCode_00081 {
public boolean search(int[] nums, int target) {
int lo = 0;
int hi = nums.length - 1;
while (lo <= hi) {
int mid = lo + (hi - lo) / 2;
if (target == nums[mid]) {
return true;
}
if (nums[lo] < nums[mid]) { // lo 和 mid 在同一边
if (target >= nums[lo] && target < nums[mid]) {
hi = mid - 1;
}
else {
lo = mid + 1;
}
} else if (nums[lo] > nums[mid]) { // lo 和 mid 不在同一边
if (target > nums[mid] && target <= nums[hi]) {
lo = mid + 1;
} else {
hi = mid - 1;
}
} else { // 不能判别 lo 和 mid 是否在同一边
++lo; // 退化到 O(n)
}
}
return false;
}
}