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/**

* Compare two version numbers version1 and version2.

* If version1 > version2 return 1; if version1 < version2 return -1;

* otherwise return 0.

*

* You may assume that the version strings are non-empty and contain only

* digits and the . character.

*

* The . character does not represent a decimal point and is used to separate

* number sequences.

*

* For instance, 2.5 is not "two and a half" or "half way to version three",

* it is the fifth second-level revision of the second first-level revision.

*

* Example 1:

* Input: version1 = "0.1", version2 = "1.1"

* Output: -1

*

* Example 2:

* Input: version1 = "1.0.1", version2 = "1"

* Output: 1

*

* Example 3:

* Input: version1 = "7.5.2.4", version2 = "7.5.3"

* Output: -1

*/

public class CompareVersionNumbers165 {

public int compareVersion(String version1, String version2) {

String[] v1 = version1.split("\\.");

String[] v2 = version2.split("\\.");

int len = Math.min(v1.length, v2.length);

for (int i=0; i<len; i++) {

int i1 = Integer.valueOf(v1[i]);

int i2 = Integer.valueOf(v2[i]);

if (i1 == i2) {

continue;

}

return Integer.compare(i1, i2);

}

int l = len;

while (l < v1.length) {

if (Integer.valueOf(v1[l]) > 0) return 1;

l++;

}

l = len;

while (l < v2.length) {

if (Integer.valueOf(v2[l]) > 0) return -1;

l++;

}

return 0;

}

public int compareVersion2(String version1, String version2) {

String[] v1 = version1.split("\\.");

String[] v2 = version2.split("\\.");

int len = Math.max(v1.length, v2.length);

for (int i=0; i<len; i++) {

int i1 = i < v1.length ? Integer.valueOf(v1[i]) : 0;

int i2 = i < v2.length ? Integer.valueOf(v2[i]) : 0;

if (i1 == i2) {

continue;

}

return Integer.compare(i1, i2);

}

return 0;

}

}