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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int rows;
  6.     cout << "Enter the number of rows: ";
  7.     cin >> rows;
  8.  
  9.  // Upper half of the butterfly pattern
  10.     for (int i = 0; i < rows; i++) {
  11.         // Print left side stars
  12.         for (int j = 0; j <= i; j++) {
  13.             cout << "1 ";
  14.         }
  15.  
  16.         // Print spaces in the middle
  17.         int spaces = 2 * (rows - i - 1);
  18.         for (int j = 0; j < spaces; j++) {
  19.             cout << "  ";
  20.         }
  21.  
  22.         // Print right side stars
  23.         for (int j = 0; j <= i; j++) {
  24.             cout << "3 ";
  25.         }
  26.  
  27.         cout << endl;
  28.     }
  29.  
  30.     // Lower half of the butterfly pattern
  31.     for (int i = rows - 1; i >= 0; i--) {
  32.         // Print left side stars
  33.         for (int j = 0; j <= i; j++) {
  34.             cout << "2 ";
  35.         }
  36.  
  37.         // Print spaces in the middle
  38.         int spaces = 2 * (rows - i - 1);
  39.         for (int j = 0; j < spaces; j++) {
  40.             cout << "  ";
  41.         }
  42.  
  43.         // Print right side stars
  44.         for (int j = 0; j <= i; j++) {
  45.             cout << "4 ";
  46.         }
  47.  
  48.         cout << endl;
  49.     }
  50.  
  51.     return 0;
  52. }
  53.  
  54.  
Success #stdin #stdout 0.01s 5300KB
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stdin
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8
stdout
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Enter the number of rows: 1                             3 
1 1                         3 3 
1 1 1                     3 3 3 
1 1 1 1                 3 3 3 3 
1 1 1 1 1             3 3 3 3 3 
1 1 1 1 1 1         3 3 3 3 3 3 
1 1 1 1 1 1 1     3 3 3 3 3 3 3 
1 1 1 1 1 1 1 1 3 3 3 3 3 3 3 3 
2 2 2 2 2 2 2 2 4 4 4 4 4 4 4 4 
2 2 2 2 2 2 2     4 4 4 4 4 4 4 
2 2 2 2 2 2         4 4 4 4 4 4 
2 2 2 2 2             4 4 4 4 4 
2 2 2 2                 4 4 4 4 
2 2 2                     4 4 4 
2 2                         4 4 
2                             4
https://ideone.com/RJzVEb
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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