public class Solution
{
    
    public int getHeight(int []nums, int n) 
    {
        int []dp = new int[n];
        int len = 1;
        dp[0] = nums[0];
        for(int i=1; i<n; i++)
        {
            int pos = getPos(dp, nums[i], len);
            if(pos < len) dp[pos] = nums[i];
            else dp[len++] = nums[i];
        }
        return len;
    }
    public int getPos(int []dp, int num, int len)
    {
        int left = 0;
        int right = len-1;
        while(left <= right)
        {
            int mid = (left+right)/2;
            if(num == dp[mid]) return mid;
            else if(num > dp[mid]) left = mid+1;
            else right = mid-1;
        }
        return left;
    }
    
}