duplicates

问题 Example: Given a string (in this example char *word ) you want to find duplicate characters (bytes). I wanted to know if someone can explain to me how the following works: int table[256] = {0}; for (int i = 0; i < len; i++) table[word[i]]++; After that you can check with another loop if duplicate or not like: for (int i = 0; i < len; i++) if (table[word[i]] > 1) { … } How does this work? I don't understand why duplicated chars are > 1 in the table? 回答1: Transferring my comments into a semi

问题 This question already has answers here : How do I remove repeated elements from ArrayList? (38 answers) Closed 2 years ago . I have a list of list: List<List<Integer>> myList = new ArrayList<>(); What would be the best way to remove the duplicated list in myList? For example, in the following list of list: [[-1,0,1],[-1,-1,2],[-1,0,1]] I would like to reduce it to: [[-1,0,1],[-1,-1,2]] Thanks! 回答1: The easiest way is to copy it into an order-preserving set (or, more generally, any kind of set

问题 I have seen this issue around (See links at bottom) but I can't seem to figure out an answer. The problem is that I insert data on a table with an auto increment ID that is a primary key, and another field with a UNIQUE index to avoid duplicates. This works, but when that happens the ID is incremented, although no data has been stored. Would it be better to remove the auto increment, and handle it myself, selecting the max(ID)? At the moment I have tried several strategies to make it work as

问题 I am using luasql. I have two tables of this type: IPINFO CREATE TABLE `ipstats` ( `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT, `ip` VARCHAR(15) NOT NULL, `last_used` DATETIME NOT NULL DEFAULT '1981-09-30 00:00:00', PRIMARY KEY (`id`), UNIQUE INDEX `ip` (`ip`) ) COLLATE='utf8_general_ci' ENGINE=MyISAM ROW_FORMAT=DEFAULT and another table ipnstats: CREATE TABLE `ipnstats` ( `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT, `ipstats_id` INT(10) UNSIGNED NOT NULL, `nick` VARCHAR(32) NOT NULL,

问题 I have a lists: nums = [1, 2, 3, 1, 5, 2, 7, 11] I am trying to make a function that returns how many times each number appears in the lists. Output may look like: 1 occurred 2 times 2 occurred 2 times 3 occurred 1 time 5 occurred 1 time ... ... This is what I have tried so far: -Create dictionary for each element in list -Have nested loop go through every element and check it against every other element -If elements match add one to the dictionary key of that element The problem: Everytime

问题 I have a lists: nums = [1, 2, 3, 1, 5, 2, 7, 11] I am trying to make a function that returns how many times each number appears in the lists. Output may look like: 1 occurred 2 times 2 occurred 2 times 3 occurred 1 time 5 occurred 1 time ... ... This is what I have tried so far: -Create dictionary for each element in list -Have nested loop go through every element and check it against every other element -If elements match add one to the dictionary key of that element The problem: Everytime

问题 Each record could have up to 40 different person_user.description fields. Problem is, I am getting duplicate rows because records have multiple description entries. Can you help me put those additional duplicates on the same record row like: |1|badge.bid|person.first_name|person.last_name|person.type|1|2|3|4|5|etc|40| |2|badge.bid|person.first_name|person.last_name|person.type|1|2|3|4|5|etc|40| |3|badge.bid|person.first_name|person.last_name|person.type|1|2|3|4|5|etc|40| instead of this: |1

问题 Each record could have up to 40 different person_user.description fields. Problem is, I am getting duplicate rows because records have multiple description entries. Can you help me put those additional duplicates on the same record row like: |1|badge.bid|person.first_name|person.last_name|person.type|1|2|3|4|5|etc|40| |2|badge.bid|person.first_name|person.last_name|person.type|1|2|3|4|5|etc|40| |3|badge.bid|person.first_name|person.last_name|person.type|1|2|3|4|5|etc|40| instead of this: |1

问题 I have a df, Sr.No Name Class Data 0 1 Sri 1 sri is a good player 1 '' Sri 2 sri is good in cricket 2 '' Sri 3 sri went out 3 2 Ram 1 Ram is a good player 4 '' Ram 2 sri is good in cricket 5 '' Ram 3 Ram went out 6 3 Sri 1 sri is a good player 7 '' Sri 2 sri is good in cricket 8 '' Sri 3 sri went out 9 4 Sri 1 sri is a good player 10 '' Sri 2 sri is good in cricket 11 '' Sri 3 sri went out 12 '' Sri 4 sri came back I am trying to drop duplicates based on ["Name","Class","Data"]. The goal is

问题 Each an every item should have an uniquie SecondNo + Drawing combination. Due to misentries, some combinations are there two times. I need to create a report with ABAP which identifies those combinations and does not reflect the others. Item: SecNo: Drawing: 121 904 5000 double 122 904 5000 double 123 816 5100 124 813 5200 125 812 4900 double 126 812 4900 double 127 814 5300 How can I solve this? I tried 2 approaches and failed: Sorting the data and tried to print out each one when the value