Solution.java

class Solution {
    public int findLength(int[] nums1, int[] nums2) {
        int m = nums1.length;
        int n = nums2.length;
        int[][] f = new int[m + 1][n + 1];
        int ans = 0;
        for (int i = 1; i <= m; ++i) {
            for (int j = 1; j <= n; ++j) {
                if (nums1[i - 1] == nums2[j - 1]) {
                    f[i][j] = f[i - 1][j - 1] + 1;
                    ans = Math.max(ans, f[i][j]);
                }
            }
        }
        return ans;
    }
}