Quick convolution for 64-bit integers


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Convolution is a mathematical operation utilized in sign processing, picture processing, and different fields to mix two features in an effort to produce a 3rd perform. It’s outlined because the integral of the product of two features, one in every of which is flipped and shifted over time. It’s typically represented utilizing the image “*” and is helpful for filtering, smoothing, and different operations on alerts and pictures.

Quick Convolution:

  • Quick convolution for 64-bit integers in aggressive programming and supply an outline of the completely different algorithms and strategies which are generally used. 
  • Moreover, it is going to discover the benefits and limitations of every technique, in addition to the trade-offs that should be made when selecting a specific method. So allow us to transfer ahead and unlock the facility of lightning-fast calculations with the last word information to Quick convolution for 64-bit integers in aggressive programming.
  • Quick convolution is a way used to effectively calculate the convolution of two sequences, a, and b, which is outlined because the sum of the merchandise of the corresponding components of a and b, shifted by completely different quantities. 

The convolution operation is usually represented by the image ‘*’ and might be represented mathematically as:

c[n] = sum(a[m] * b[n – m]) for m = 0 to n

Steps concerned within the implementation of the code:

  • Outline the 2 features (sign and filter)
  • Flip the filter perform.
  • Shift the filter perform over time.
  • Calculate the product of the 2 features.
  • Combine the product over time.
  • Plot the outcome.

Under is the code for the above method:


#embrace <cmath>

#embrace <iostream>

utilizing namespace std;


double convolution(double sign[], double filter[],

                   int measurement)



    double outcome = 0;

    for (int i = 0; i < measurement; i++) {

        outcome += sign[i] * filter[size - 1 - i];


    return outcome;



int fundamental()




    double sign[] = { 1, 2, 3, 4, 5 };

    double filter[] = { 0.1, 0.2, 0.3 };

    int measurement = sizeof(sign) / sizeof(sign[0]);



    double conv_result = convolution(sign, filter, measurement);



    cout << "Convolution outcome: " << conv_result << endl;


    return 0;



Convolution outcome: 2.2

Widespread Algorithms for Quick convolution are:

  • Quick Fourier Rework (FFT) algorithm
  • Karatsuba algorithm

Quick Fourier Rework (FFT) algorithm:

  • This algorithm makes use of the properties of advanced numbers and trigonometric features to transform the convolution operation right into a point-wise multiplication operation within the frequency area. 
  • This enormously reduces the computational complexity of the operation and makes it potential to carry out convolutions of huge sequences in a comparatively quick period of time. 
  • Nonetheless, the FFT algorithm might be troublesome to implement and will not be appropriate for all sorts of issues.

Karatsuba algorithm:

  • This algorithm is predicated on a divide-and-conquer method and is usually used to carry out the multiplication of huge integers. 
  • The Karatsuba algorithm can be used for convolution by treating the enter sequences as two giant integers after which making use of the multiplication algorithm to the sequences. 
  • The Karatsuba algorithm is comparatively easy to implement and is usually used as a fallback choice when different algorithms aren’t appropriate.

Karatsuba vs FFT algorithm:

  • The Karatsuba algorithm is an environment friendly algorithm for multiplying giant integers. It reduces the variety of multiplications required by breaking the integers into smaller chunks and utilizing a recursive method.
  • FFT (Quick Fourier Rework) is an environment friendly algorithm for calculating the discrete Fourier rework of a sign. It’s broadly utilized in sign processing and different fields to investigate alerts and pictures.
  • By way of efficiency, FFT is mostly thought of to be quicker than Karatsuba for giant inputs. FFT algorithms make the most of the symmetry and periodicity of the enter sign to scale back the variety of calculations required. Nonetheless, the Karatsuba algorithm is extra environment friendly for small inputs.


  • Quick convolution is a way used to effectively calculate the convolution of two sequences which is a basic operation in lots of areas of pc science, together with aggressive programming.
  • For giant integers, completely different algorithms similar to FFT, Karatsuba, and Toom-Cook dinner can be utilized, every with its personal benefits and limitations. 
  • Moreover, strategies similar to modulus operation, sliding window method, and using environment friendly libraries can be utilized to optimize efficiency and cut back computational complexity. 
  • In aggressive programming, it’s vital to think about the precise necessities of the issue and select the very best mixture of algorithms, strategies and optimizations accordingly.


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