Competitive Programming
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Channel Posts
Day 35 Question: Rain water trapping in C++
Given *n* non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
Input: [0,1,0,2,1,0,1,3,2,1,2,1]
Output: 6
Before solving this problem, please take a look at “Container with most water (https://www.prodevelopertutorial.com/find-the-container-with-most-water-explanation-with-diagram-and-solution-in-cpp-language/)” problem. There I have explained in detail, how two pointers work.
Solution:
https://www.prodevelopertutorial.com/rain-water-trapping-in-c/
| 2 | Group Anagrams when given an array of strings in C++
Example:
Input: ["eat", "tea", "tan", "ate", "nat", "bat"],
Output:
[
["ate","eat","tea"],
["nat","tan"],
["bat"]
]
This problem can be solved easily using Maps.
The solution involves 2 steps:
1. Sort the element and make it as the key.
2. Take the value and place it in the key.
Solution:
https://www.prodevelopertutorial.com/group-anagrams-in-c/ | 5 516 |
| 3 | Day 33 Question: Given an n x n 2D matrix rotate it by 90 degrees (clockwise) in C++ in place
You have to rotate the image in-place (https://en.wikipedia.org/wiki/In-place_algorithm), which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.
Example 1:
Given input matrix =
[
[1,2,3],
[4,5,6],
[7,8,9]
],
rotate the input matrix in-place such that it becomes:
[
[7,4,1],
[8,5,2],
[9,6,3]
]
Solution:
https://www.prodevelopertutorial.com/given-an-n-x-n-2d-matrix-rotate-it-by-90-degrees-clockwise-in-c-in-place/
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| 5 | Check if Two Trees are Mirror Structure to each other
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