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‎README.md

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@@ -115,7 +115,7 @@ Your ideas/fixes/algorithms are more than welcome!
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|473|[Matchsticks to Square](https://leetcode.com/problems/matchsticks-to-square/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_473.java) | O(n!) |O(n) | Medium| Backtracking, DFS
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|472|[Concatenated Words](https://leetcode.com/problems/concatenated-words/)|[Solution](../master/src/main/java/com/fishercoder/solutions/ConcatenatedWords.java) | O(n^2) |O(n) | Hard| Trie, DP, DFS
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|469|[Convex Polygon](https://leetcode.com/problems/convex-polygon/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_469.java) | O(n) |O(1) | Medium| Math
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|468|[Validate IP Address](https://leetcode.com/problems/validate-ip-address/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_468.java) | O(n^2) |O(n) | Hard| Trie, DP, DFS
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|468|[Validate IP Address](https://leetcode.com/problems/validate-ip-address/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_468.java) | O(n) |O(1) | Medium | String
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|467|[Unique Substrings in Wraparound String](https://leetcode.com/problems/unique-substrings-in-wraparound-string/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_467.java) | O(n) |O(1) | Medium| DP
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|466|[Count The Repetitions](https://leetcode.com/problems/count-the-repetitions/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_466.java)| O(max(m,n))|O(1) | Hard| DP
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|464|[Can I Win](https://leetcode.com/problems/can-i-win/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_464.java)| O(2^n)|O(n) | Medium| DP

‎src/main/java/com/fishercoder/solutions/_468.java

Lines changed: 84 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,17 +1,30 @@
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package com.fishercoder.solutions;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* 468. Validate IP Address
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* Write a function to check whether an input string is a valid IPv4 address or IPv6 address or neither.
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IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers, each ranging from 0 to 255, separated by dots ("."), e.g.,172.16.254.1;
7-
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IPv4 addresses are canonically represented in dot-decimal notation, which consists of four decimal numbers,
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each ranging from 0 to 255, separated by dots ("."), e.g.,172.16.254.1;
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Besides, leading zeros in the IPv4 is invalid. For example, the address 172.16.254.01 is invalid.
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IPv6 addresses are represented as eight groups of four hexadecimal digits, each group representing 16 bits. The groups are separated by colons (":"). For example, the address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 is a valid one. Also, we could omit some leading zeros among four hexadecimal digits and some low-case characters in the address to upper-case ones, so 2001:db8:85a3:0:0:8A2E:0370:7334 is also a valid IPv6 address(Omit leading zeros and using upper cases).
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IPv6 addresses are represented as eight groups of four hexadecimal digits,
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each group representing 16 bits.
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The groups are separated by colons (":").
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For example, the address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 is a valid one.
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Also, we could omit some leading zeros among four hexadecimal digits and
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some low-case characters in the address to upper-case ones,
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so 2001:db8:85a3:0:0:8A2E:0370:7334 is also a valid IPv6 address(Omit leading zeros and using upper cases).
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However, we don't replace a consecutive group of zero value with a single empty group using two consecutive colons (::) to pursue simplicity. For example, 2001:0db8:85a3::8A2E:0370:7334 is an invalid IPv6 address.
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However, we don't replace a consecutive group of zero value with a single empty
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group using two consecutive colons (::) to pursue simplicity.
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For example, 2001:0db8:85a3::8A2E:0370:7334 is an invalid IPv6 address.
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Besides, extra leading zeros in the IPv6 is also invalid. For example, the address 02001:0db8:85a3:0000:0000:8a2e:0370:7334 is invalid.
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Besides, extra leading zeros in the IPv6 is also invalid.
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For example, the address 02001:0db8:85a3:0000:0000:8a2e:0370:7334 is invalid.
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Note: You may assume there is no extra space or special characters in the input string.
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@@ -42,9 +55,72 @@
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*/
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public class _468 {
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static final String NEITHER = "Neither";
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public String validIPAddress(String IP) {
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String[] bytes = IP.split(".");
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return "";
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if (IP.contains(".")) {
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return isValidIPv4(IP);
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} else if (IP.contains(":")) {
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return isValidIPv6(IP);
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} else return NEITHER;
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}
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private String isValidIPv6(String IP) {
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if (getDelimiterCount(IP, ':') != 7) return NEITHER;
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String[] bytes = IP.split("\\:");
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if (bytes.length != 8) return NEITHER;
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for (int i = 0; i < 8; i++) {
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if (hasInvalidIPV6Char(bytes[i])) return NEITHER;
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try {
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if (bytes[i].length() > 4) return NEITHER;
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int intNum = Integer.parseInt(bytes[i], 16);
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if (intNum < 0) return NEITHER;
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if (i == 0 && intNum != 0 && bytes[i].charAt(0) == '0') return NEITHER;
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} catch (Exception e) {
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return NEITHER;
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}
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}
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return "IPv6";
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}
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private String isValidIPv4(String IP) {
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if (getDelimiterCount(IP, '.') != 3) return NEITHER;
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String[] bytes = IP.split("\\.");
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if (bytes.length != 4) return NEITHER;
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for (String num : bytes) {
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try {
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int intNum = Integer.parseInt(num);
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if (intNum > 255 || intNum < 0) return NEITHER;
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if (intNum != 0 ) {
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for (int i = 0; i < num.length(); i++) {
96+
if (num.charAt(i) == '0') return NEITHER;
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else break;
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}
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} else if (intNum == 0) {
100+
if (num.length() != 1) return NEITHER;
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}
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} catch (Exception e) {
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return NEITHER;
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}
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}
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return "IPv4";
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}
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private boolean hasInvalidIPV6Char(String str) {
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Set<Character> set = new HashSet<>(Arrays.asList('0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f', 'A', 'B', 'C', 'D', 'E', 'F'));
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for (char c : str.toCharArray()) {
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if (!set.contains(c)) return true;
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}
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return false;
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}
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private int getDelimiterCount(String ip, char delimiter) {
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int count = 0;
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for (char c : ip.toCharArray()) {
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if (c == delimiter) count++;
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}
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return count;
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}
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}

‎src/test/java/com/fishercoder/_468Test.java

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,85 @@
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package com.fishercoder;
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import com.fishercoder.solutions._468;
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import org.junit.BeforeClass;
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import org.junit.Test;
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7+
import static org.junit.Assert.assertEquals;
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/**
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* Created by stevesun on 6/10/17.
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*/
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public class _468Test {
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private static _468 test;
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@BeforeClass
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public static void setup(){
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test = new _468();
18+
}
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@Test
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public void test1(){
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assertEquals("IPv4", test.validIPAddress("172.16.254.1"));
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}
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@Test
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public void test2(){
27+
assertEquals("IPv6", test.validIPAddress("2001:0db8:85a3:0:0:8A2E:0370:7334"));
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}
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@Test
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public void test3(){
32+
assertEquals("Neither", test.validIPAddress("2001:0db8:85a3::8A2E:0370:7334"));
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}
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@Test
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public void test4(){
37+
assertEquals("Neither", test.validIPAddress("02001:0db8:85a3:0000:0000:8a2e:0370:7334"));
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}
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@Test
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public void test5(){
42+
assertEquals("Neither", test.validIPAddress("256.256.256.256"));
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}
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@Test
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public void test6(){
47+
assertEquals("Neither", test.validIPAddress("2001:0db8:85a3:0:0:8A2E:0370:7334:"));
48+
}
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@Test
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public void test7(){
52+
assertEquals("Neither", test.validIPAddress("01.01.01.01"));
53+
}
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@Test
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public void test8(){
57+
assertEquals("Neither", test.validIPAddress("00.0.0.0"));
58+
}
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60+
@Test
61+
public void test9(){
62+
assertEquals("Neither", test.validIPAddress("000.0.0.0"));
63+
}
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65+
@Test
66+
public void test10(){
67+
assertEquals("Neither", test.validIPAddress("0000.0.0.0"));
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}
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@Test
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public void test11(){
72+
assertEquals("IPv4", test.validIPAddress("0.0.0.0"));
73+
}
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75+
@Test
76+
public void test12(){
77+
assertEquals("Neither", test.validIPAddress("1081:db8:85a3:01:-0:8A2E:0370:7334"));
78+
}
79+
80+
@Test
81+
public void test13(){
82+
assertEquals("Neither", test.validIPAddress("1081:db8:85a3:01:z:8A2E:0370:7334"));
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}
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}

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