msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
Code Issues Projects Releases Wiki Activity

add q34

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pull/6/head
yuanguangxin 5 years ago
parent f306cb3332
commit cded4a22b7
3 changed files with 102 additions and 54 deletions
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95
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1
README.md
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@ -79,6 +79,7 @@
* [q23_合并K个排序链表](/src/分治法/q23_合并K个排序链表)
* [q33_搜索旋转排序数组](/src/分治法/q33_搜索旋转排序数组)
* [q34_在排序数组中查找元素的第一个和最后一个位置](/src/分治法/q34_在排序数组中查找元素的第一个和最后一个位置)
### 动态规划

60
src/分治法/q34_在排序数组中查找元素的第一个和最后一个位置/Solution.java
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@ -0,0 +1,60 @@
package 分治法.q34_在排序数组中查找元素的第一个和最后一个位置;
/**
* 二分法 o(log(n))
*/
public class Solution {
public int[] searchRange(int[] nums, int target) {
if (nums == null || nums.length < 1) {
return new int[]{-1, -1};
}
int midIndex = find(0, nums.length - 1, nums, target);
int[] rs = new int[2];
rs[0] = midIndex;
rs[1] = midIndex;
if (midIndex == -1) {
return rs;
}
while (nums[rs[0]] == target && rs[0] > 0) {
int temp = find(0, rs[0] - 1, nums, target);
if (temp == -1) {
break;
} else {
rs[0] = temp;
}
}
while (nums[rs[1]] == target && rs[1] < nums.length - 1) {
int temp = find(rs[1] + 1, nums.length - 1, nums, target);
if (temp == -1) {
break;
} else {
rs[1] = temp;
}
}
return rs;
}
public int find(int beginIndex, int endIndex, int[] nums, int target) {
if (beginIndex == endIndex) {
if (nums[beginIndex] == target) {
return beginIndex;
} else {
return -1;
}
}
int mid = (endIndex - beginIndex) / 2 + beginIndex;
if (nums[mid] > target) {
return find(beginIndex, mid, nums, target);
} else if (nums[mid] < target) {
return find(mid + 1, endIndex, nums, target);
} else {
return mid;
}
}
public static void main(String[] args) {
new Solution().searchRange(new int[]{2, 2}, 2);
}
}
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