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14. Longest Common Prefix #29

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zwfang merged 1 commit into master from longest-common-prefix
Dec 31, 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 @@ -37,6 +37,7 @@ continually updating 😃.

### String
* [3. Longest Substring Without Repeating Characters](./src/0003_longest_substring_without_repeating_characters/longest_substring_without_repeating_characters.go)   *`sliding window;`*  *`hash table`*
* [14. Longest Common Prefix](src/0014_longest_common_prefix/lcp.go)
* [17. Letter Combinations of a Phone Number](./src/0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go)   *`tree`*
* [20. Valid Parentheses](./src/0020_valid_parentheses/valid_parentheses.go)   *`stack`*
* [67. Add Binary](./src/0067_add_binary/add_binary.go)   *`brute force`*
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30 changes: 30 additions & 0 deletions src/0014_longest_common_prefix/lcp.go
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/*
14. Longest Common Prefix
https://leetcode.com/problems/longest-common-prefix/

Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string "".
*/
// time: 2018年12月31日

package lcp

// time complexity: O(len(strs) * max len of string)
// space complexity: O(1)
func longestCommonPrefix(strs []string) string {
if 0 == len(strs) {
return ""
}
res := ""
for i := 0; i < len(strs[0]); i++ {
c := strs[0][i]
for j := 1; j < len(strs); j++ {
if i >= len(strs[j]) || strs[j][i] != c {
return res
}
}
res += string(c)
}
return res
}
25 changes: 25 additions & 0 deletions src/0014_longest_common_prefix/lcp_test.go
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package lcp

import "testing"

func TestLongestCommonPrefix(t *testing.T) {
testCases := [][]string{
{"flower", "flow", "flight"},
{"dog", "racecar", "car"},
{},
{""},
}

expected := []string{
"fl",
"",
"",
"",
}

for index, strs := range testCases {
if res := longestCommonPrefix(strs); res != expected[index] {
t.Errorf("expected %s, got %s", expected[index], res)
}
}
}
1 change: 1 addition & 0 deletions src/README.md
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Expand Up @@ -10,6 +10,7 @@
|0009|[9. Palindrome Number](0009_palindrome_number/palindrome_number.go)|Easy|*`math`*|
|0011|[11. Container With Most Water](0011_container_with_most_water/container_with_most_water.go)|Medium|*`array;`* *`double index`*|
|0013|[13. Roman to Integer](0013_roman_to_integer/roman_to_integer.go)|Easy|*`math`*|
|0014|[14. Longest Common Prefix](0014_longest_common_prefix/lcp.go)|Easy||
|0017|[Letter Combinations of a Phone Number](0017_letter_combination_of_a_phone_number/letter_combination_of_phone_number.go)|Medium|*`tree`*|
|0020|[Valid Parentheses](0020_valid_parentheses/valid_parentheses.go)|Easy|*`string;`* *`stack`*|
|0021|[Merge Two Sorted Lists](0021_merge_two_sorted_lists/mergeTwoLists.go)|Easy|*`linked list`*|
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