Day-4
First Unique Character in a String
Leetcode #387
Algorithm: Stack
Related Video: https://www.youtube.com/watch?v=KnWqCfIfHX0
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First Unique Character in a String
Leetcode #387
Algorithm: Stack
Related Video: https://www.youtube.com/watch?v=KnWqCfIfHX0
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LeetCode
First Unique Character in a String - LeetCode
Can you solve this real interview question? First Unique Character in a String - Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.
Example 1:
Input: s = "leetcode"
Output: 0
Explanation:…
Example 1:
Input: s = "leetcode"
Output: 0
Explanation:…
Day-4 (Solution)
First Unique Character in a String
Leetcode #387
Algorithm: Stack
Solution: https://gist.github.com/lavakush-m-tiwari/137cfbe73d678c860e216487cbfb12f2
Related Video: https://www.youtube.com/watch?v=KnWqCfIfHX0
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First Unique Character in a String
Leetcode #387
Algorithm: Stack
Solution: https://gist.github.com/lavakush-m-tiwari/137cfbe73d678c860e216487cbfb12f2
Related Video: https://www.youtube.com/watch?v=KnWqCfIfHX0
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LeetCode
First Unique Character in a String - LeetCode
Can you solve this real interview question? First Unique Character in a String - Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1.
Example 1:
Input: s = "leetcode"
Output: 0
Explanation:…
Example 1:
Input: s = "leetcode"
Output: 0
Explanation:…
Day-5
Remove K Digits
Leetcode #402
Algorithm: Stack, Greedy, Monotonic Stack
Related Video: https://www.youtube.com/watch?v=3QJzHqNAEXs
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Remove K Digits
Leetcode #402
Algorithm: Stack, Greedy, Monotonic Stack
Related Video: https://www.youtube.com/watch?v=3QJzHqNAEXs
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LeetCode
Remove K Digits - LeetCode
Can you solve this real interview question? Remove K Digits - Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num.
Example 1:
Input: num = "1432219", k = 3…
Example 1:
Input: num = "1432219", k = 3…
Day-5 (Solution)
Remove K Digits
Leetcode #402
Algorithm: Stack, Greedy, Monotonic Stack
Solution: https://gist.github.com/lavakush-m-tiwari/70f4b730498bb9fc39fafb83449fd261
Related Video: https://www.youtube.com/watch?v=3QJzHqNAEXs
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Remove K Digits
Leetcode #402
Algorithm: Stack, Greedy, Monotonic Stack
Solution: https://gist.github.com/lavakush-m-tiwari/70f4b730498bb9fc39fafb83449fd261
Related Video: https://www.youtube.com/watch?v=3QJzHqNAEXs
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LeetCode
Remove K Digits - LeetCode
Can you solve this real interview question? Remove K Digits - Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num.
Example 1:
Input: num = "1432219", k = 3…
Example 1:
Input: num = "1432219", k = 3…
Day-6
Implement Queue using Stacks
Leetcode #232
Algorithm: Stack
Related Video: https://www.youtube.com/watch?v=xSa0sD-RqMg
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Implement Queue using Stacks
Leetcode #232
Algorithm: Stack
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LeetCode
Implement Queue using Stacks - LeetCode
Can you solve this real interview question? Implement Queue using Stacks - Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push, peek, pop, and empty).
Implement…
Implement…
Hello everyone. Due to non-availability, we couldn't post problems. We are resuming today with the same topic.
Practice well :)
Practice well :)
Day-6(Solution):
Implement Queue using Stacks
Leetcode #232
Algorithm: Stack
Solution: https://gist.github.com/lavakush-m-tiwari/f8ad3f00eb062fa24f96cb4a4b6d6e03
Related Video: https://www.youtube.com/watch?v=xSa0sD-RqMg
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Implement Queue using Stacks
Leetcode #232
Algorithm: Stack
Solution: https://gist.github.com/lavakush-m-tiwari/f8ad3f00eb062fa24f96cb4a4b6d6e03
Related Video: https://www.youtube.com/watch?v=xSa0sD-RqMg
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LeetCode
Implement Queue using Stacks - LeetCode
Can you solve this real interview question? Implement Queue using Stacks - Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push, peek, pop, and empty).
Implement…
Implement…
Day-7
Simplify Path
#121
Algorithm: Stack, String
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Simplify Path
#121
Algorithm: Stack, String
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LeetCode
Simplify Path - LeetCode
Can you solve this real interview question? Simplify Path - You are given an absolute path for a Unix-style file system, which always begins with a slash '/'. Your task is to transform this absolute path into its simplified canonical path.
The rules of a…
The rules of a…
Day-7 (Solution)
Simplify Path
#121
Algorithm: Stack, String
Solution: https://gist.github.com/lavakush-m-tiwari/bb2a6f9310f0364084b2e8fb744f7bef
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Simplify Path
#121
Algorithm: Stack, String
Solution: https://gist.github.com/lavakush-m-tiwari/bb2a6f9310f0364084b2e8fb744f7bef
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LeetCode
Simplify Path - LeetCode
Can you solve this real interview question? Simplify Path - You are given an absolute path for a Unix-style file system, which always begins with a slash '/'. Your task is to transform this absolute path into its simplified canonical path.
The rules of a…
The rules of a…
Day-8
Car Fleet
#853
Algorithm: Stack, Sorting
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Car Fleet
#853
Algorithm: Stack, Sorting
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LeetCode
Car Fleet - LeetCode
Can you solve this real interview question? Car Fleet - There are n cars at given miles away from the starting mile 0, traveling to reach the mile target.
You are given two integer arrays position and speed, both of length n, where position[i] is the starting…
You are given two integer arrays position and speed, both of length n, where position[i] is the starting…
Day-8
Car Fleet
#853
Algorithm: Stack, String
Solution: https://gist.github.com/lavakush-m-tiwari/5b0ad973da6033a20999ab1f2752cabb
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Car Fleet
#853
Algorithm: Stack, String
Solution: https://gist.github.com/lavakush-m-tiwari/5b0ad973da6033a20999ab1f2752cabb
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LeetCode
Car Fleet - LeetCode
Can you solve this real interview question? Car Fleet - There are n cars at given miles away from the starting mile 0, traveling to reach the mile target.
You are given two integer arrays position and speed, both of length n, where position[i] is the starting…
You are given two integer arrays position and speed, both of length n, where position[i] is the starting…
Day-9
Basic Calculator II
#227
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Basic Calculator II
#227
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LeetCode
Basic Calculator II - LeetCode
Can you solve this real interview question? Basic Calculator II - Given a string s which represents an expression, evaluate this expression and return its value.
The integer division should truncate toward zero.
You may assume that the given expression…
The integer division should truncate toward zero.
You may assume that the given expression…
Day-9 (Solution)
Basic Calculator II
#227
Algorithm: Stack
Solution: https://gist.github.com/lavakush-m-tiwari/0269815de6c072246c20fe907ee1dae7
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Basic Calculator II
#227
Algorithm: Stack
Solution: https://gist.github.com/lavakush-m-tiwari/0269815de6c072246c20fe907ee1dae7
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LeetCode
Basic Calculator II - LeetCode
Can you solve this real interview question? Basic Calculator II - Given a string s which represents an expression, evaluate this expression and return its value.
The integer division should truncate toward zero.
You may assume that the given expression…
The integer division should truncate toward zero.
You may assume that the given expression…
Day-10
Basic Calculator
#224
Algorithm: Stack, String
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Basic Calculator
#224
Algorithm: Stack, String
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LeetCode
Basic Calculator - LeetCode
Can you solve this real interview question? Basic Calculator - Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation.
Note: You are not allowed to use any built-in function…
Note: You are not allowed to use any built-in function…
Day-10 (Solution)
Basic Calculator
#224
Algorithm: Stack, String
Solution: https://gist.github.com/lavakush-m-tiwari/2c6439fc299bd9674c0da5093d75c8d5
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Basic Calculator
#224
Algorithm: Stack, String
Solution: https://gist.github.com/lavakush-m-tiwari/2c6439fc299bd9674c0da5093d75c8d5
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LeetCode
Basic Calculator - LeetCode
Can you solve this real interview question? Basic Calculator - Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation.
Note: You are not allowed to use any built-in function…
Note: You are not allowed to use any built-in function…
Day-11
Decode String
#394
Algorithm: Stack, String , String
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Decode String
#394
Algorithm: Stack, String , String
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LeetCode
Decode String - LeetCode
Can you solve this real interview question? Decode String - Given an encoded string, return its decoded string.
The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. Note that k is…
The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. Note that k is…
Day-11 (Solution)
Decode String
#394
Algorithm: Stack, String , String
Solution: https://gist.github.com/lavakush-m-tiwari/802eeb6bc381a2fb5a75574119686179
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Decode String
#394
Algorithm: Stack, String , String
Solution: https://gist.github.com/lavakush-m-tiwari/802eeb6bc381a2fb5a75574119686179
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LeetCode
Decode String - LeetCode
Can you solve this real interview question? Decode String - Given an encoded string, return its decoded string.
The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. Note that k is…
The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. Note that k is…
Day-12
Minimum Add to Make Parentheses Valid
#921
Algorithm: Stack, String, Greedy
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Minimum Add to Make Parentheses Valid
#921
Algorithm: Stack, String, Greedy
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LeetCode
Minimum Add to Make Parentheses Valid - LeetCode
Can you solve this real interview question? Minimum Add to Make Parentheses Valid - A parentheses string is valid if and only if:
* It is the empty string,
* It can be written as AB (A concatenated with B), where A and B are valid strings, or
* It can…
* It is the empty string,
* It can be written as AB (A concatenated with B), where A and B are valid strings, or
* It can…
Day-12 (Solution)
Minimum Add to Make Parentheses Valid
#921
Algorithm: Stack, String, Greedy
Solution:https://gist.github.com/lavakush-m-tiwari/6650c3ad786b363752e6bde98fa5564a
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Minimum Add to Make Parentheses Valid
#921
Algorithm: Stack, String, Greedy
Solution:https://gist.github.com/lavakush-m-tiwari/6650c3ad786b363752e6bde98fa5564a
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LeetCode
Minimum Add to Make Parentheses Valid - LeetCode
Can you solve this real interview question? Minimum Add to Make Parentheses Valid - A parentheses string is valid if and only if:
* It is the empty string,
* It can be written as AB (A concatenated with B), where A and B are valid strings, or
* It can…
* It is the empty string,
* It can be written as AB (A concatenated with B), where A and B are valid strings, or
* It can…
Day-13
Sum of Subarray Ranges
#2104
Algorithm: Stack
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Sum of Subarray Ranges
#2104
Algorithm: Stack
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LeetCode
Sum of Subarray Ranges - LeetCode
Can you solve this real interview question? Sum of Subarray Ranges - You are given an integer array nums. The range of a subarray of nums is the difference between the largest and smallest element in the subarray.
Return the sum of all subarray ranges of…
Return the sum of all subarray ranges of…