Q61 Ugly Number 2 - LeetCode 264

PHOTO

Sun Apr 02 2023 08:10:47 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public boolean isUgly(int n) {
        /* Q61 dp playlist , every cell denote ith ugly number . we make 3 
        pointers for 2,3,5 keeping every pointer at 1 . we traverse the dp and 
        find next ugly number by multiplying prev ugly number by all 3 factors
        and taking minimum of all and moving pointer which gave minimum value by
        1.
        -> if more than 1 pointer gives the same minimum value we both all such
        pointers by 1
        */
        if(n == 1)return true;

        int[] dp = new int[n+1];
        dp[1] = 1;  //1 is 1st ugly number
        
        int f2 = 1 , f3 = 1 , f5 = 1;

        for(int i = 2 ; i <= n ; i++){
            int val2 = 2 * dp[f2] , val3 = 3 * dp[f3] , val5 = 5 * dp[f5];

            //ugly number will be min of all vals
            dp[i] = Math.min(val2 , Math.min(val3,val5));

            //updating pointers
            if(dp[i] == val2) f2++;
            if(dp[i] == val3) f3++;
            if(dp[i] == val5) f5++;

            //if before reaching n 
            if(dp[i] == n)
            return true;

            // else if(dp[i] > n)
            // return false;
        }

        for(int i = 0 ;i < n ; i++)
        System.out.print(dp[i] + " ");

        return false;
    }
}

https://leetcode.com/problems/ugly-number-ii/

Save snippets that work from anywhere online with our extensions

Available in the Chrome Web Store

Get Firefox Add-on

Get VS Code extension

Comments

More like this

DP level 2

@Ayush_dabas07

Q66 Distinct Echo Substrings - LeetCode 1316 (rabin karp rolling hash -> O(n^2)) Q66 Distinct Echo Substrings - LeetCode 1316(O(n^3) solution) Q65 Interleaving String - LeetCode 97 Q64 Frog Jump - LeetCode 403 Q63 Champagne Tower - LeetCode 799 Q62 Super Ugly Number - LeetCode 313 Q61 Ugly Number 2 - LeetCode 264 Q60 Minimum Insertion Steps to Make a String Palindrome - LeetCode 1316 Q59 Temple Offerings | Practice | GeeksforGeeks Q58 Word Break - LeetCode 139 Q57 Arithmetic Slices II - Subsequence - LeetCode 446 Q56 Arithmetic Slices - LeetCode 413 Q55 Max sum of M non-overlapping subarrays of size K - GeeksforGeeks (tabulization) Q55 Max sum of M non-overlapping subarrays of size K - GeeksforGeeks (memoization) Q54 Maximum Sum of 3 Non-Overlapping Subarrays - LeetCode 689 Q53 Maximum Sum of Two Non-Overlapping Subarrays - LeetCode 1031 Q52 Maximum difference of zeros and ones in binary string | Practice | GeeksforGeeks Q51 Mobile numeric keypad | Practice | GeeksforGeeks Q50 Distinct Transformation LeetCode Playground ( tabulization approach) Q50 - Distinct Transformation- LeetCode Playground ( recursion + memoization approach) Q49 Highway BillBoards - Coding Ninjas Codestudio approach 2 Q49 Highway BillBoards - Coding Ninjas Codestudio (approach 1 LIS) Q48 Knight Probability in Chessboard - LeetCode 688 Q47 Cherry Pickup - LeetCode 741 (recursion approach) Q46 Super Egg Drop - LeetCode 887 Q45 Predict the Winner - LeetCode 486 Q45 Optimal Strategy For A Game | Practice | GeeksforGeeks | leetcode 46 Q44 Largest Sum Subarray of Size at least K | Practice | GeeksforGeeks Q42 Maximum Subarray - LeetCode 53 Q41 Minimum Cost To Make Two Strings Identical | Practice | GeeksforGeeks Q40 Minimum ASCII Delete Sum for Two Strings - LeetCode 712 Q39 Scramble String - LeetCode 87 Q38 Edit Distance - LeetCode 72 Q37 Regular Expression Matching - LeetCode 10 Q36 Wildcard Matching - LeetCode Q35 Longest Repeating Subsequence | Practice | GeeksforGeeks Q34 Longest Common Substring | Practice | GeeksforGeeks Q33 Count Different Palindromic Subsequences - LeetCode 730 Q32 Number of distinct subsequences | Practice | GeeksforGeeks Q31 Longest Palindromic Substring - LeetCode Q30 Count Palindromic Subsequences | Practice | GeeksforGeeks Q29 Longest Palindromic Subsequence - LeetCode 516 Q28 Longest Common Subsequence - LeetCode 1143 Q27 Minimum Score Triangulation of Polygon - LeetCode 1039 Q26 Optimal binary search tree | Practice | GeeksforGeeks Q24 Matrix Chain Multiplication | Practice | GeeksforGeeks Q23 Palindrome Partitioning II - LeetCode 132 Q23 Palindrome Partitioning II - LeetCode - 132 ( n^3 approach) Q22 Palindromic Substrings - LeetCode 647 Q21 Rod Cutting | Practice | GeeksforGeeks Q20 Minimum Score Triangulation of Polygon - LeetCode 1039 Q19 Intersecting Chords in a Circle | Interviewbit Q18 Generate Parentheses - LeetCode 22 Q17 PepCoding | Count Of Valleys And Mountains Q16 Unique Binary Search Trees - LeetCode 96 Q15 Catalan Number Minimum Score of a Path Between Two Cities - 2492 Q14 Perfect Squares - LeetCode Q13 Russian Doll Envelopes - LeetCode (LIS in NlogN - accepted solution) Q13 Russian Doll Envelopes - LeetCode 354 solution1(LIS in O(n^2)) Q12 PepCoding | Maximum Non-overlapping Bridges Q11 Longest Bitonic subsequence | Practice | GeeksforGeeks Q10 Maximum sum increasing subsequence | Practice | GeeksforGeeks Q9 PepCoding | Print All Longest Increasing Subsequences Q8 Longest Increasing Subsequence - LeetCode 300 Q7 2 Keys Keyboard - LeetCode 650 Q-6 PepCoding | Print All Results In 0-1 Knapsack Q5 PepCoding | Print All Paths With Target Sum Subset Q4 PepCoding | Print All Paths With Maximum Gold Q3 PepCoding | Print All Paths With Minimum Cost Q2 Jump Game II - LeetCode 45 Q1 Maximal Square - LeetCode 221 Q67 Longest Increasing Subsequence - LeetCode 300 ( LIS O(nlogn) solution) Q43 K-Concatenation Maximum Sum - LeetCode 1191 Q13 Russian Doll Envelopes - LeetCode 354 ( LIS -> O(nlogn) solution) Q25 Burst Balloons - LeetCode 312

Browse more snippets >>