441.Arranging Coins - Leetcode题解

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7.Reverse Integer

9.Palindrome Number

13.Roman to Integer

19.Remove Nth Node from End of List

20.Valid Parentheses

21.Merge Two Sorted Lists

22.Generate Parentheses

26.Remove Duplicates from Sorted Array

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28.Implement strStr()

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46.Permutations

53.Maximum Subarray

58.Length of Last Word

59.Spiral Matrix II

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77.Combinations

83.Remove Duplicates from Sorted List

88.Merge Sorted Array

104.Maximum Depth of Binary Tree

107.Binary Tree Level Order Traversal II

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101.Symmetric Tree

105.Construct Binary Tree from Preorder and Inorder Traversal

110.Balanced Binary Tree

111.Minimum Depth of Binary Tree

118.Pascals Triangle

119.Pascals Triangle II

121.Best Time to Buy and Sell Stock

125.Valid Palindrome

131.Palindrome Partitioning

140.Word Break II

141.Linked List Cycle

143.Reorder List

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171.Excel Sheet Column Number

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204.Count Primes

205.Isomorphic Strings

206.Reverse Linked List

217.Contains Duplicate

219.Contains Duplicate II

225.Implement Stack Using Queues

226.Invert Binary Tree

231.Power of Two

232.Implement Queue Using Stack

234.Palindrome Linked List

237.Delete Node in a Linked List

240.Search a 2D Matrix II

242.Valid Anagram

257.Binary Tree Paths

263.Ugly Numbers

268.Missing Number

278.First Bad Version

284.Peeking Iterator

290.Word Pattern

303.Range Sum Query Immutable

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342.Power of Four

344.Reverse String

345.Reverse Vowels of a String

349.Intersection of Two Arrays

350.Intersection of Two Arrays II

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374.Guess Number Higher or Lower

383.Ransom Note

387.First Unique Character in a String

401.Binary Watch

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409.Longest Palindrome

414.Third Maximum Number

415.Add Strings

427.Construct Quad Tree

429.N Ary Tree Level Order Traversal

434.Number of Segments in a String

437.Path Sum III

438.Find All Anagrams in a String

441.Arranging Coins

443.String Compression

447.Number of Boomerangs

448.Find All Numbers Disappeared in an Array

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485.Max Consecutive Ones

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532.K-diff Pairs in an Array

535.Encode and Decode TinyURL

538.Convert BST to Greater Tree

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543.Diameter of Binary Tree

551.Student Attendace Record I

557.Reverse Words in a String

558.Quad Tree Intersection

559.Maxmium Depth of N Ary Tree

561.Array Partition I

563.Binary Tree Tilt

566.Reshape the Matrix

572.Subtree of Another Tree

575.Distribute Candies

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590.N Ary Tree Postorder Traversal

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637.Average of Levels in Binary Tree

643.Maximum Average Subarray I

645.Set Mismatch

653.Two Sum IV - Input is a BST

654.Maximum Binary Tree

657.Robot Return to Origin

661.Image Smoother

665.Non-Decreasing Array

669.Trim a Binary Search Tree

671.Second Minimum Node in a Binary Tree

680.Valid Palindrome II

682.Baseball Game

686.Repeated String Match

687.Longest Univalue Path

690.Employee Importance

693.Binary Number with Alternating Bits

696.Count Binary Substring

697.Degree of an Array

700.Search in a Binary Search Tree

701.Insert Into a Binary Search Tree

703.Kth Largest Element in a Stream

704.Binary Search

705.Design Hashset

706.Design Hashmap

707.Design Linked List

709.To Lower Case

713.Subarray Product Less Than K

717.1 Bit and 2 Bit Characters

720.Longest Word in Dictionary

724.Find Pivot Index

728.Self Dividing Numbers

739.每日温度

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746.Min Cost Climbing Stairs

747.Largest Number At Least Twice Of Others

748.Shortest Completing Word

754.Reach A Number

762.Prime Number of Set Bits in Binary Representation

766.Toeplitz Matrix

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783.Minimum Distance Between BST Nodes

784.Letter Case Permutation

788.Rotated Digits

796.Rotate String

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806.Number of Lines to Write String

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811.Subdomain Visit Count

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814.Binary Tree Pruning

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821.Shortest Distance to a Character

829.Consecutive Numbers Sum

830.Position of Large Groups

831.Masking Personal Information

832,Flipping an Image

833.Find And Replace in String

835,Image Overlap

836.Rectangle Overlap

840.Magic Squares In Grid

844.Backspace String Compare

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859.Buddy Strings

860.Lemonade Change

861.Score After Flipping Matrix

864.Shortest Path to Get All Keys

865.Smallest Subtree with all the Deepest Nodes

866.Prime Palindrome

872.Leaf Similar Trees

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876.Middle of the Linked List

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887.Super Egg Drop

888.Fair Candy Swap

892.Surface Area of 3D Shapes

893.Groups of Special Equivalent Strings

894.All Possible Full Binary Trees

896.monotonic array

897.increasing order search tree

900.RLE Iterator

901.Online Stock Span

905.Sort Array by Parity

908.Smallest Range I

910.Smallest Range II

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914.X of a Kind in a Deck of Cards

915.Partition Array into Disjoint Intervals

916.Word Subsets

917.Reverse Only Letters

922.Sort Array by Parity II

925.Long Pressed Name

929.Unique Email Address

937.Reorder Log Files

938.Range Sum of BST

941.Valid Mountain Array

942.Di String Match

944.Delete Column to Make Sorted

949.Largest Time For Given Digits

950.Reveal Cards in Increasing Order

953.Verifying an Alien Dictionary

961.N Repeated Element in Size 2N Array

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970.Powerful Integers

974.Subarray Sums Divisible By K

976.Largest Perimeter Triangle

977.Squares of a Sorted Array

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994.Rotting Oranges

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999.Available Captures for Rook

1002.Find Common Characters

1005.Maximise Sum of Array after K Negations

1008.Construct Binary Search Tree from Preorder Traversal

1021.Remove Outermost Parentheses

1025.Divisor Game

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1030.Matrix Cells in Distance Order

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1395.Count Number of Teams

面试题 16.01

面试题 16.18

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441.Arranging Coins

441.Arranging Coins
难度:Easy
You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins.
Given n, find the total number of full staircase rows that can be formed.
n is a non-negative integer and fits within the range of a 32-bit signed integer.
1
Example 1:
2
​
3
n = 5
4
​
5
The coins can form the following rows:
6
¤
7
¤ ¤
8
¤ ¤
9
​
10
Because the 3rd row is incomplete, we return 2.
11
Example 2:
12
​
13
n = 8
14
​
15
The coins can form the following rows:
16
¤
17
¤ ¤
18
¤ ¤ ¤
19
¤ ¤
20
​
21
Because the 4th row is incomplete, we return 3.
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简单的等差数列求项数的题目，一元二次方程求根公式。
1
class Solution {
2
public:
3
    int arrangeCoins(int n) {
4
        return int((sqrt(1+8.0*n)-1)/2);
5
    }
6
};
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执行用时 : 4 ms, 在所有 C++ 提交中击败了96.23%的用户
内存消耗 :8 MB, 在所有 C++ 提交中击败了95.18%的用户

438.Find All Anagrams in a String

443.String Compression

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