unique

Getting unique tuples from a list [duplicate]

由 こ雲淡風輕ζ 提交于 2020-02-24 00:39:40
问题 This question already has answers here : Getting unique tuples out of a python set (4 answers) Closed 2 years ago . I have a list of tuples whose elements are like this: aa = [('a', 'b'), ('c', 'd'), ('b', 'a')] I want to treat ('a', 'b') and ('b', 'a') as the same group and want to extract only unique tuples. So the output should be like this: [('a', 'b'), ('c', 'd')] How can I achieve this efficiently as my list consists of millions of such tuples? 回答1: Convert to a frozenset , hash, and

Getting unique tuples from a list [duplicate]

由 强颜欢笑 提交于 2020-02-24 00:35:45
问题 This question already has answers here : Getting unique tuples out of a python set (4 answers) Closed 2 years ago . I have a list of tuples whose elements are like this: aa = [('a', 'b'), ('c', 'd'), ('b', 'a')] I want to treat ('a', 'b') and ('b', 'a') as the same group and want to extract only unique tuples. So the output should be like this: [('a', 'b'), ('c', 'd')] How can I achieve this efficiently as my list consists of millions of such tuples? 回答1: Convert to a frozenset , hash, and

PAT 1041 Be Unique (20)

由 扶醉桌前 提交于 2020-02-19 22:21:20
#include<iostream> #include<cstdio> #include<string> #include<cstring> #include<queue> #include<vector> #include<cmath> #include<iomanip> #include<algorithm> using namespace std; const int SIZE = 100000+5; int arrCount[SIZE]; int main() { int N,i,x; vector<int> v; memset(arrCount,0,sizeof(arrCount)); // cin>>N; scanf("%d",&N); for(i=0; i<N; i++) { scanf("%d",&x); // cin>>x; arrCount[x]++; v.push_back(x); } for(i=0; i<v.size(); i++) if(arrCount[v[i]] == 1) { cout<<v[i]<<endl; break; } if(i == v.size()) cout<<"None"<<endl; return 0; } 　　 来源： https://www.cnblogs.com/yanhaiming/archive/2012/12/15

Conditional unique constraint with multiple fields in oracle db

由 落花浮王杯 提交于 2020-02-13 08:10:18
问题 I have this table: XPTO_TABLE (id, obj_x, date_x, type_x, status_x) I wanna create a unique constraint that applies to the fields (obj_x, date_x, type_x) only when status_x <> 5 . I have tried to create this one but Oracle says: line 1: ORA-00907: missing right parenthesis CREATE UNIQUE INDEX UN_OBJ_DT_TYPE_STATUS ON XPTO_TABLE( (CASE WHEN STATUS_X <> 5 THEN (OBJ_X, TO_CHAR (DATE_X, 'dd/MM/yyyy'), TYPE_X) ELSE NULL END)); What's the correct syntax ? 回答1: @jamesfrj: it looks like you are

AspNet Identity RequireUniqueEmail = false throws exception on CreateAsync

由 六眼飞鱼酱① 提交于 2020-02-06 07:54:29
问题 I initialize UserValidator of the UserManager with RequireUniqueEmail=false , the validator accepts duplicate emails for sure (tried to inherit it and override the ValidateAsync() method). However, when I try to create another user with a unique UserName but with an Email that already exists in the AspNetUsers table, CreateAsync() throws Validation failed for one or more entities. See 'EntityValidationErrors' property for more details. There is just one validation error: Email myemail@email

AspNet Identity RequireUniqueEmail = false throws exception on CreateAsync

由 拟墨画扇 提交于 2020-02-06 07:54:25
问题 I initialize UserValidator of the UserManager with RequireUniqueEmail=false , the validator accepts duplicate emails for sure (tried to inherit it and override the ValidateAsync() method). However, when I try to create another user with a unique UserName but with an Email that already exists in the AspNetUsers table, CreateAsync() throws Validation failed for one or more entities. See 'EntityValidationErrors' property for more details. There is just one validation error: Email myemail@email

Combination of a Collection with Repetitions

由 好久不见. 提交于 2020-02-06 04:19:06
问题 There are a lot of links on http://stackoverflow.com for how to do combinations: Generating combinations in c++ But these links presume to draw from an infinite set without repetition. When given a finite collection which does have repetition, these algorithms construct duplicates. For example you can see the accepted solution to the linked question failing on a test case I constructed here: http://ideone.com/M7CyFc Given the input set: vector<int> row {40, 40, 40, 50, 50, 60, 100}; I expect

Combination of a Collection with Repetitions

由 江枫思渺然 提交于 2020-02-06 04:19:05
问题 There are a lot of links on http://stackoverflow.com for how to do combinations: Generating combinations in c++ But these links presume to draw from an infinite set without repetition. When given a finite collection which does have repetition, these algorithms construct duplicates. For example you can see the accepted solution to the linked question failing on a test case I constructed here: http://ideone.com/M7CyFc Given the input set: vector<int> row {40, 40, 40, 50, 50, 60, 100}; I expect

Python: While Statement = Statement Print associated Values

由 半世苍凉 提交于 2020-02-05 09:10:18
问题 In Python I currently have a Dictionary with a composite Key. In this dictionary there are multiple occurences of these keys. (The keys are comma-separated): (A,B), (A,C), (A,B), (A,D), (C,A), (A,B), (C,A), (C,B), (C,B) I already have something that totals the unique occurrences and counts the duplicates which gives me a print-out similar to this: (A,B) with a count of 4 , (A,C) with a count of 2 , (B,C) with a count of 6 , etc. I would like to know how to code a loop that would give me the

XSLT 1.0 - Create a Unique, Ordered List

由 ℡╲_俬逩灬. 提交于 2020-01-30 09:46:47
问题 I'm trying to create a transform where I generate an ordered unique list (where a hyphen separates two values. I have source <?xml version="1.0"?> <results> <result> <Name>Blue</Name> <Author>Hat</Author> <TrackNum>5</TrackNum> </result> <result> <Name>Red</Name> <Author>Car</Author> <TrackNum>2</TrackNum> </result> <result> <Name>Blue</Name> <Author>Hat</Author> <TrackNum>345</TrackNum> </result> </results> And want the output (ordered by 'Name') :: Blue - Hat :: Red - Car XLST - This
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