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217. Contains Duplicate #54

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Merged
zwfang merged 1 commit into master from 217-Contains-Duplicate
Jan 7, 2019
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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 @@ -26,6 +26,7 @@ continually updating 😃.
* [200. Number of Islands](src/0200_number_of_island/number_of_island.go)   *`dfs;`*  *`bfs`*
* [209. Minimum Size Subarray Sum](./src/0209_minimum_size_subarray_sum/minimum_size_subarray_sum.go)   *`sliding window`*
* [215. Kth Largest Element in an Array](./src/0215_kth_largest_element_in_an_array/kthleiaa.go)   *`sort`*
* [217. Contains Duplicate](src/0217_contains_duplicate/contains_duplicate.go)   *`map`*
* [283. Move Zeroes(solution1)](./src/0283_move_zeroes/move_zeroes.go)   *`sliding window`*
* [283. Move Zeroes(solution2)](./src/0283_move_zeroes/move_zeroes2.go)   *`sliding window`*
* [303. Range Sum Query - Immutable](src/0303_range_sum_query/rsqim.go)
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28 changes: 28 additions & 0 deletions src/0217_contains_duplicate/contains_duplicate.go
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/*
217. Contains Duplicate
https://leetcode.com/problems/contains-duplicate/

Given an array of integers, find if the array contains any duplicates.

Your function should return true if any value appears at least twice in the array,
and it should return false if every element is distinct.
*/
// time: 2019年01月07日

package cd

// using HashTable
// time complexity: O(n)
// space complexity: O(n)
func containsDuplicate(nums []int) bool {
record := make(map[int]int)

for _, num := range nums {
if _, ok := record[num]; !ok {
record[num] = 1
} else {
return true
}
}
return false
}
17 changes: 17 additions & 0 deletions src/0217_contains_duplicate/contains_duplicate_test.go
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package cd

import "testing"

func TestContainsDuplicate(t *testing.T) {
testCases := [][]int{
{1, 2, 3, 1},
{1, 2, 3, 4},
}
expected := []bool{true, false}

for index, nums := range testCases {
if res := containsDuplicate(nums); res != expected[index] {
t.Errorf("expected %t, got %t", expected[index], res)
}
}
}
1 change: 1 addition & 0 deletions src/README.md
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Expand Up @@ -68,6 +68,7 @@
|0206|[206. Reverse Linked List](0206_reverse_linked_list/reverse_linked_list.go)|Easy|*`linked list`*|
|0209|[Minimum Size Subarray Sum](./0209_minimum_size_subarray_sum/minimum_size_subarray_sum.go)|Medium|*`sliding window`*|
|0215|[215. Kth Largest Element in an Array](0215_kth_largest_element_in_an_array/kthleiaa.go)|Medium|*`sort`*|
|0217|[217. Contains Duplicate](0217_contains_duplicate/contains_duplicate.go)|Easy|*`map`*|
|0226|[Invert Binary Tree](./0226_invert_binary_tree/invert_binary_tree.go)|Easy|*`recursion; `* *`binary tree`*|
|0283|[Move Zeroes(solution1)](./0283_move_zeroes/move_zeroes.go) <br/> [Move Zeroes(solution2)](./0283_move_zeroes/move_zeroes2.go)|Easy|*`array`*|
|0300|[Longest Increasing Subsequence](./0300_longest_increasing_subsequence/lis.go)|Medium|*`dp`*|
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