Concept: Equality and Identity Before we begin, we need to clarify two concepts first Equality: Also known as value equality, it indicates that two items are equal in value under a certain comparison rule. Equality only considers whether the values are equal. For example, if the values of two integer variables a and b are […]
Tag: equality
[C++] Operator overloading case – String class ④ (overloading the double equal sign == operator | overloading the inequality sign != operator | code example)
Article directory 1. Overloading the double equal sign / inequality sign operator 1. Equality judgment == operator overloading 2. Overloading the inequality sign != operator 3. Complete code example 1. String.h class header file 2. String.cpp class implementation 3. Test.cpp test class 1. Overloading the double equal sign / inequality sign operator 1. Equal judgment […]
Why can’t I use the equals method of BigDecimal for equality comparison?
Interview answer Because the equals method of BigDecimal is different from compareTo, the equals method will compare two parts, namely the value (value) and the scale (scale), and for the two numbers 1.0 and 1, although their values are the same, but the precision is not the same, so it will return false when using […]
[JavaScript 10] comparison operator non-equality operator string non-string primitive type value object strict equality operator strict inequality operator equality operator inequality operator
Comparison operators non-equality operator: string non-equality operator: not-string 1 primitive type value 2 objects strict equality operator 1 different types of values 2 primitive type values of the same class 3 Composite type values 4 undefined and null 5 Strict inequality operators 6 equality operator 7 inequality operator Comparison operators are used to compare the […]
Quantification of subject fit–Based on TF-IDF algorithm and Rearrangement Inequality
Article directory summary overall architecture process Algorithm derivation and introduction code technical details Summary In order to measure candidates’ ability to grasp the news topic and the fit of writing to the topic, the author invented a quantitative algorithm for topic fit. This algorithm uses the TF-IDF algorithm of nltk and sklearn.feature_extraction.text to get the […]
4 types of methods for judging the equality of two arrays in JS
In JavaScript, an array is essentially a special kind of object whose type value returns object. If we need to compare whether two arrays are equal, we cannot use === (or ==) to judge like comparing basic types (String, Number, Boolean, etc.) , so if you want to compare arrays for equality, you need to […]
Arthur Java (14): How to judge object equality using hashCode() and equals()?
Define the difference equals(): The function is to judge whether two objects are equal. hashCode(): The function is to obtain the hash code, also known as the hash code; It actually returns an int integer. The function of this hash code is to determine the index position of the object in the hash table. A […]
Equality checks in JavaScript
1. Classification of comparison operations JavaScript provides three different value comparison operators: ===: strict equality (three equal signs) ==: loose equality (two equal signs) Object. is() The difference in three ways: A double equal sign (==) will perform a type conversion, and NaN, -0, and + 0 will be treated specially (so NaN != NaN, […]
CF1772DAbsolute Sorting (mathematics, inequality)
【Description】 Given a length of no no sequence of positive integers for n a a a, please choose an integer x ( 0 ≤ x ≤ 1 0 9 ) x(0\le x\le 10^9) x(0≤x≤109), put all a i a_i ai? becomes ∣ x ? a i ∣ |x-a_i| ∣x?ai?∣, so that it satisfies: a 1 […]
Difference + sorting inequality + greedy
: Come on, come on, the game will be held in a few days 1. Difference The idea of difference: Given a[1], a[2]…a[N], construct a difference array so that a[i]=b[1] + b[2] + …b [i] In general, a[i] is the prefix and array of b[1~i], then b[1], b[2]…b[i] that constitute a[i] is the difference array. […]