LeetCode-Solutions/Algorithms/src/165. Compare Version Numbers/Code/solution.java at main · withaarzoo/LeetCode-Solutions · GitHub

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class Solution {
    public int compareVersion(String version1, String version2) {
        int i = 0, j = 0;
        int n = version1.length(), m = version2.length();

        while (i < n || j < m) {
            long num1 = 0, num2 = 0;
            // parse next revision from version1
            while (i < n && version1.charAt(i) != '.') {
                num1 = num1 * 10 + (version1.charAt(i) - '0');
                i++;
            }
            if (i < n && version1.charAt(i) == '.') i++;

            // parse next revision from version2
            while (j < m && version2.charAt(j) != '.') {
                num2 = num2 * 10 + (version2.charAt(j) - '0');
                j++;
            }
            if (j < m && version2.charAt(j) == '.') j++;

            if (num1 < num2) return -1;
            if (num1 > num2) return 1;
        }
        return 0;
    }
}