Given a string consists of lower English letters only, your job is to count the minimum number of turns the printer needed in order to print it.
Published in Dynamic Programming.
You must be logged in to post a comment. Strange Printer By zxi on September 21, Problem: There is a strange printer with the following two special requirements: The printer can only print a sequence of the same character each time.
At each turn, the printer can print new characters starting from and ending at any places, and will cover the original existing characters. Example Input : "aaabbb". Output : 2. Explanation : Print "aaa" first and then print "bbb". Input : "aba".
Explanation : Print "aaa" first and then print "b" from the second place of the stringwhich will cover the existing character 'a'. Author: Huahua. Venmo huahualeetcode.
Here is the problem's address. Test data: test case 1:[0, 0, 0, 0, 3] The th case test case 2:[0,0,1,1,1,2,2,2,3,3,4] The rd case. However, when I click Submit Solution, it output [0,0,3,3] for test case 1.
And then I try to comment out the code "free result ;", it output [0,0,1,1,2,2,3,3,4,4] for test case 2. Test case 2 is behind the test case 1, which means that test case 1 was passed after commenting out the code "free result ;".
Consider what happens with arrays like [1, 2, 2, 2, 2, 2]. It'll happily read past the end. Learn more. Why my C code on leetcode have different behavior between run code and submit? Ask Question. Asked 3 years, 11 months ago. Active 3 years, 11 months ago. Viewed times. It seems that the code I comment out has no relation with the result, what's wrong with my code? Coordinate35 Coordinate35 11 1 1 bronze badge. Active Oldest Votes.
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Methods vs. Functions
LeetCode: Surrounded Regions. LeetCode: Search Insert Position. LeetCode: Accounts Merge. LeetCode: Longest Word in Dictionary. LeetCode: Valid Parentheses.
LeetCode: Daily Temperatures. LeetCode: Relative Sort Array. LeetCode: Longest Common Subsequence. LeetCode: Course Schedule. LeetCode: Web Crawler Multithreaded. Leetcode: Flatten 2D Vector. LeetCode: Max Area of Island.First sort the interval based on the start value. We can see the strange behavior of y since it only contains the reference of x instead of a copy of x. So commonly, it is best to initialize a copy of ArrayList if we want to store its value. Please comment down below if you think otherwise.
When we pass char array as a parameter, we need initialize a whole char array every time to store its old value when it calls recursive function. Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue.
Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively. Follow up: A rather straight forward solution is a two-pass algorithm using counting sort. Solutions: 1. Since it requires us to do one-pass to sort the array, we need to look closely into array.
Because three are only three different integers, all we have to do is put the right integer at right spot. If we have 2, we put it after 1. Given an array of non-negative integers, you are initially positioned at the first index of the array. We can use greedy algorithm to solve this problem. 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. The above elevation map is represented by array [0,1,0,2,1,0,1,3,2,1,2,1].
In this case, 6 units of rain water blue section are being trapped. Thanks Marcos for contributing this image! For each bar, find the left highest bar and right highest bar and the water contained is min leftmax, rightmax — A[i].
Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order ie, sorted in ascending order. Here are some examples. Inputs are in the left-hand column and its corresponding outputs are in the right-hand column. Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet a,b,c must be in non-descending order.
This is one of N-sum problems and the solution can be derived from Two Sum. Algorithm, Java, Computer, IT. Skip to content.
Home About. Given a collection of intervals, merge all overlapping intervals.
For example, Given [1,3],[2,6],[8,10],[15,18], return [1,6],[8,10],[15,18]. Solution: First sort the interval based on the start value. Replace character? Could you come up with an one-pass algorithm using only constant space?
Each element in the array represents your maximum jump length at that position. Determine if you are able to reach the last index. For example, Given [0,1,0,2,1,0,1,3,2,1,2,1], return 6.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.
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The situation remains the same. The same error occurred. This docker seems to be using a Debian system. I entered the container and executed the same command as above to install nodejs v It works! But I am a docker rookie, I can not easily manage the server directly through code-server webpage, such as nginx mysql php on the server.
This test was on a server in China created a long time ago, when I installed nodejs v After installing the plugin manually, the plugin works fine. Since it seems that you are using code server a third-party distribution. But on the server, sometimes it works normally, sometimes it doesn't. If it is a problem with code-server, it should go wrong in other situations. That's strange.
I think I should have solved my problem. It's indeed a problem with code-server. Just install Node. My problem should be caused by user permissions. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Copy link Quote reply. I also encountered a similar initialization problem. I have no clue how to solve this problem.
When the code is run, this is the stdout:. It seems to generate the correct combinations, however these combinations are not being appended correctly to the result array. The result array comes back to an array of empty arrays. I tried going through the code by hand, but I am not too sure what is causing this to happen. This problem has a simple linear solution O Nwhere N -- is the sum you're trying to reach. The point is, you don't have to generate all combinations to count them.
Learn more. Asked 1 month ago. Active 1 month ago. Viewed 30 times. When the code is run, this is the stdout: [1, 1, 1, 1] [1, 1, 2] [1, 2, 1] [1, 3] [2, 1, 1] [2, 2] [3, 1] [, , , , , , ] It seems to generate the correct combinations, however these combinations are not being appended correctly to the result array.
Matthew P Matthew P 1. Try if result. That makes so much sense, that worked! Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook.
Sign up using Email and Password. Post as a guest Name.How to use LeetCode effectively
Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. This is an easy level LeetCode question, obviously not much code to review.
If you'd like to review, please do so. Thank you! Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input would have exactly one solution, and you may not use the same element twice. The method signature looks strange: nums should be a const reference, and the return type should just be a std::pair. But that's probably the fault of LeetCode. Or more generally: Don't blindly assume that these coding challenges provide good code to begin with. In this way you are bound to create an instance of your Solution class to call the method, without modifying the internal state of your Solution object.
It would be better to use static and call the method like this:. In the Leetcode contest if I understand well it has been guaranteed there is always a solution to the problem, so you will always find a couple of indexes in the for loop meeting the conditions. In a more general situation where finding a solution cannot be guaranteed it could be better return a couple of indexes like [-1, -1]. Then your method could be rewritten in the following way mantaining the same signature of the original method:.
You're assuming that a solution exists, due to lack of break condition in the loop.
That may work for Leetcode; however, that is not a reasonable assumption. If a solution doesn't exist, you're in Undefined Behavior Land by accessing the array out of bounds.
Assuming it's possible that a solution doesn't exist, you might want to return an empty vector or a std::optional. None of your three solutions are object-oriented.
Note: there is nothing wrong with that, in fact, the problem domain is really anemic, so there is not much to model with objects anyway. However, not being object-oriented, there is no need for objects here. The defining characteristics of instance methods are that they are dispatched ad-hoc often dynamically and thus allow for runtime ad-hoc polymorphism, and that they have privileged access to the internal representation of the object via their invisible zeroth this argumentor in Python the very much visible first argument.
They should just be functions or in the case of Java static methodssomewhat like this:. There is no restriction in the problem description about the size of the numbers, nor the size of the array. Python int can be arbitrarily large, so there is no problem, but for Java, you should use java. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 1 month ago. Active 29 days ago. Viewed times. Problem Given an array of integers, return indices of the two numbers such that they add up to a specific target.
Emma Emma 2, 2 2 gold badges 4 4 silver badges 27 27 bronze badges. Active Oldest Votes. Roland Illig Roland Illig Many of them are basically puzzlesand not even programming puzzles but math puzzles.