题目：

题解：

class Solution {public int compareVersion(String version1, String version2) {int n = version1.length(), m = version2.length();int i = 0, j = 0;while (i < n || j < m) {int x = 0;for (; i < n && version1.charAt(i) != '.'; ++i) {x = x * 10 + version1.charAt(i) - '0';}++i; // 跳过点号int y = 0;for (; j < m && version2.charAt(j) != '.'; ++j) {y = y * 10 + version2.charAt(j) - '0';}++j; // 跳过点号if (x != y) {return x > y ? 1 : -1;}}return 0;}
}