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cmp

pra's play answered on July 19, 2022 Popularity 1/10 Helpfulness 1/10

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priority queue stl cmp function explain plz

In the C++ Standard Template Library (STL), a priority queue is a container adapter that provides constant time lookup of the largest (or smallest) element in the collection, and logarithmic time insertion and extraction of elements from anywhere within the collection.

When creating a priority queue, you can provide a custom comparison function object to determine the ordering of elements. This comparison function object must be a binary predicate that takes two arguments and returns a boolean value indicating whether the first argument should come before the second in the ordering.

Here's an example of a custom comparison function object for a priority queue of integers that orders the elements in decreasing order:

csharp

struct CompareInt {
  bool operator()(const int& a, const int& b) const {
    return a > b;
  }
};

In this example, the operator() function returns true if a should come before b in the ordering (i.e., if a is greater than b). This means that when elements are inserted into the priority queue, they will be sorted in decreasing order.

You can then create a priority queue using this custom comparison function object as follows:

c

std::priority_queue<int, std::vector<int>, CompareInt> pq;

In this example, the third argument to the std::priority_queue template specifies the custom comparison function object to use.

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Contributed on Apr 26 2023

pra's play

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cmp file1.txt file2.txt # Indicates differences between 2 files
#Options
# -b -> displays differing bytes in output
# -i 10:12 -> indicating that both files are identical after 10 bytes
# skipped from first file and 12 bytes skipped from second file
# -l -> print byte position and byte value for all differing bytes.
# -s -> without displaying the differing byte and line
# -n 50 -> indicating files are identical for starting 50 bytes
# -v -> gives the output information and exits

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Contributed on Jul 19 2022

Armandres

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