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80 remove duplicates 2 solved #11

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Merged
zwfang merged 1 commit into master from remove-duplicates-from-sorted-array2
Dec 21, 2018
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ continually updating 😃.
* [1. Two Sum](./src/0001_two_sum/twosum.go)   *`lookup table;`*  *`hash table`*
* [26. Remove Duplicates from Sorted Array](./src/0026_remove_duplicates_from_sorted_array/rdfsa.go)   *`double index;`*  *`array`*
* [27. Remove Element](src/0027_remove_element/remove_element.go)   *`double index;`*  *`array`*
* [80. Remove Duplicates from Sorted Array II](./src/0080_remove_duplicates_from_sorted_array2/rdfsa2.go)   *`double index;`*  *`array`*
* [167. Two Sum II - Input array is sorted](./src/0167_two_sum2/two_sum2.go)   *`double index;`*  *`binary search`*
* [209. Minimum Size Subarray Sum](./src/0209_minimum_size_subarray_sum/minimum_size_subarray_sum.go)   *`sliding window`*
* [283. Move Zeroes(solution1)](./src/0283_move_zeroes/move_zeroes.go)   *`sliding window`*
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46 changes: 46 additions & 0 deletions src/0080_remove_duplicates_from_sorted_array2/rdfsa2.go
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/*
80. Remove Duplicates from Sorted Array II
https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/

Given a sorted array nums, remove the duplicates in-place such that
duplicates appeared at most twice and return the new length.

Do not allocate extra space for another array, you must do this
by modifying the input array in-place with O(1) extra memory.
*/
// time: 2018年12月21日

package rdfsa2

// double index
// time complexity: O(n)
// space complexity: O(1)
func removeDuplicates(nums []int) int {
n := len(nums)
if 0 == n || 1 == n {
return n
}

var (
res = 2
i = 2
index = nextDifferentCharacterIndex(nums, i, 2) // 寻找下一个满足条件的下标
)

for index < n {
res++
nums[i] = nums[index]
i++
index = nextDifferentCharacterIndex(nums, i, index+1)
}
return res
}

func nextDifferentCharacterIndex(nums []int, j int, p int) int {
for ; p < len(nums); p++ {
if nums[j-1] == nums[j-2] && nums[p] != nums[j-1] || nums[j-1] != nums[j-2] {
break
}
}
return p
}
22 changes: 22 additions & 0 deletions src/0080_remove_duplicates_from_sorted_array2/rdfsa2_test.go
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package rdfsa2

import "testing"

func TestRemoveDuplicates(t *testing.T) {
testCases := [][]int{
{1, 1, 1, 2, 2, 3},
{1, 2, 2},
{0, 0, 1, 1, 1, 1, 2, 3, 3},
{},
{1},
{2, 2},
{2, 2, 2},
}
expected := []int{5, 3, 7, 0, 1, 2, 2}

for index, data := range testCases {
if res := removeDuplicates(data); res != expected[index] {
t.Errorf("expected %d, got %d", expected[index], res)
}
}
}
1 change: 1 addition & 0 deletions src/README.md
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Expand Up @@ -21,6 +21,7 @@
|0069|[Sqrt(x)](0069_sqrtx/sqrtx.go)|Easy|*`binary search`*|
|0070|[Climbing Stairs](./0070_climbing_stairs/climbing_stairs.go)|Easy|*`dynamic programming`*|
|0076|[Minimum Window Substring](./0076_minimum_window_substring/minimum_window_substring.go)|Hard|*`sliding window`*|
|0080|[80. Remove Duplicates from Sorted Array II](0080_remove_duplicates_from_sorted_array2/rdfsa2.go)|Medium|*`double index`*|
|0094|[Binary Tree Inorder Traversal](./0094_binary_tree_inorder_traversal/binary_tree_inorder_traversal.go)|Medium|*`binary tree`*|
|0100|[Same Tree](./0100_same_tree/same_tree.go)|Easy|*`binary tree`*|
|0101|[Symmetric Tree](./0101_symmetric_tree/symmetric_tree.go)|Easy|*`stack;`* *`recursion; `* *`iterative`*|
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