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Home Code Solutions

Summary Ranges – LeetCode Solution

Summary Ranges - LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

BhautikBhalala by BhautikBhalala
September 6, 2022
Reading Time: 2 mins read
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Leetcode All Problems Solutions

Leetcode All Problems Solutions

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  • Summary Ranges – LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.
  • C++ Summary Ranges LeetCode Solution
  • Java Summary Ranges LeetCode Solution
  • Python 3 Summary Ranges LeetCode Solution
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Summary Ranges – LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

You are given a sorted unique integer array nums.

A range [a,b] is the set of all integers from a to b (inclusive).

Return the smallest sorted list of ranges that cover all the numbers in the array exactly. That is, each element of nums is covered by exactly one of the ranges, and there is no integer x such that x is in one of the ranges but not in nums.

Each range [a,b] in the list should be output as:

  • "a->b" if a != b
  • "a" if a == b

 

Example 1:

Input: nums = [0,1,2,4,5,7]
Output: ["0->2","4->5","7"]
Explanation: The ranges are:
[0,2] --> "0->2"
[4,5] --> "4->5"
[7,7] --> "7"

Example 2:

Input: nums = [0,2,3,4,6,8,9]
Output: ["0","2->4","6","8->9"]
Explanation: The ranges are:
[0,0] --> "0"
[2,4] --> "2->4"
[6,6] --> "6"
[8,9] --> "8->9"

 

Constraints:

  • 0 <= nums.length <= 20
  • -231 <= nums[i] <= 231 - 1
  • All the values of nums are unique.
  • nums is sorted in ascending order.

C++ Summary Ranges LeetCode Solution


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class Solution {
public:
    vector<string> summaryRanges(vector<int>& arr) {
        int n = arr.size(); // extracting size of the array
        vector<string> ans; // declaring answer array to store our answer
        
        string temp = ""; // temproray string that stores all possible answer
        
        for(int i = 0; i < n; i++) // start traversing from the array
        {
            int j = i; // declare anthor pointer that will move
            
            // run that pointer until our range is not break
            while(j + 1 < n && arr[j + 1] == arr[j] + 1)
            {
                j++;
            }
            
            // if j > i, that means we got our range more than one element
            if(j > i)
            {
                temp += to_string(arr[i]); // first store starting point
                temp += "->"; // then store arrow, as question wants it
                temp += to_string(arr[j]); // and lastly store the end point
            }
            else // we got only one element as range
            {
                temp += to_string(arr[i]); // then store that element in temp
            }
            
            ans.push_back(temp); // push one possible answer string to our answer
            temp = ""; // again reintiliaze temp for new possible answers
            i = j; // and move i to j for a fresh start
        }
        
        return ans; // and at last finally return the answer array
    }
};

Java Summary Ranges LeetCode Solution


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List<String> list=new ArrayList();
	if(nums.length==1){
		list.add(nums[0]+"");
		return list;
	}
    for(int i=0;i<nums.length;i++){
    	int a=nums[i];
    	while(i+1<nums.length&&(nums[i+1]-nums[i])==1){
    		i++;
    	}
    	if(a!=nums[i]){
    		list.add(a+"->"+nums[i]);
    	}else{
    		list.add(a+"");
    	}
    }
    return list;

 



Python 3 Summary Ranges LeetCode Solution


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def summaryRanges(self, nums):
    ranges = r = []
    for n in nums:
        if `n-1` not in r:
            r = []
            ranges += r,
        r[1:] = `n`,
    return map('->'.join, ranges)



 

Array-1180
String-562
Hash Table-412
Dynamic Programming-390
Math-368
Sorting-264
Greedy-257
Depth-First Search-256
Database-215
Breadth-First Search-200
Tree-195
Binary Search-191
Matrix-176
Binary Tree-160
Two Pointers-151
Bit Manipulation-140
Stack-133
Heap (Priority Queue)-117
Design-116
Graph-108
Simulation-103
Prefix Sum-96
Backtracking-92
Counting-86
Sliding Window-73
Linked List-69
Union Find-66
Ordered Set-48
Monotonic Stack-47
Recursion-43
Trie-41
Binary Search Tree-40
Divide and Conquer-40
Enumeration-39
Bitmask-37
Queue-33
Memoization-32
Topological Sort-31
Geometry-30
Segment Tree-27
Game Theory-24
Hash Function-24
Binary Indexed Tree-21
Interactive-18
Data Stream-17
String Matching-17
Rolling Hash-17
Shortest Path-16
Number Theory-16
Combinatorics-15
Randomized-12
Monotonic Queue-9
Iterator-9
Merge Sort-9
Concurrency-9
Doubly-Linked List-8
Brainteaser-8
Probability and Statistics-7
Quickselect-7
Bucket Sort-6
Suffix Array-6
Minimum Spanning Tree-5
Counting Sort-5
Shell-4
Line Sweep-4
Reservoir Sampling-4
Eulerian Circuit-3
Radix Sort-3
Strongly Connected Componen-t2
Rejection Sampling-2
Biconnected Component-1

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Tags: Cc++14full solutionGojavajava 15java 7java 8java8javascriptkotlinLeetCodeLeetCodeSolutionpypy 3Python 2python 3rubyrustSolutionSummary Ranges
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