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  1. // Online C++ compiler to run C++ program online
  2. #include <iostream>
  3. #include<bits/stdc++.h>
  4. #include <iomanip>
  5. using namespace std;
  6. int main() {
  7.   int n;
  8.     std::cout << "Enter the value of n: ";
  9.     cin >> n;
  10.  
  11.     vector<vector<int>> matrix(n, vector<int>(n, 0));
  12.  
  13.     int num = 1,start=0,j=0;
  14.     int limit=(n-1)/2;
  15.     bool check=false;
  16.     int per_row=(n-1)/2;
  17.     if(n%2==1){
  18.         limit=2;
  19.         check=false;
  20.         per_row=2;
  21.     }else{
  22.         limit=2;
  23.         check=true;
  24.         per_row=1;
  25.     }
  26.  
  27.     for (int i = n - 1; i >= 0; i--) {
  28.         check=!check;
  29.  
  30.         if(check){
  31.             j=n-1;
  32.         }else{
  33.             j=start;
  34.         }
  35.         while(true) {
  36.             if(j<start||j==n)break;
  37.             if(check){
  38.                 matrix[i][j]=num++;
  39.                 j--;
  40.             }else{
  41.                 matrix[i][j]=num++;
  42.                 j++;
  43.             }
  44.         }
  45.         if(per_row==limit){
  46.             start+=2;
  47.             per_row=0;
  48.         }
  49.         per_row++;
  50.         if(start>=n)break;
  51.     }
  52.  
  53.      for (int i = 0; i < n; i++) {
  54.         for (int j = 0; j < n; j++) {
  55.             if (matrix[i][j] == 0)
  56.                 std::cout << std::setw(3) << " " << "\t"; 
  57.             else
  58.                 std::cout << std::setw(3) << matrix[i][j] << "\t"; 
  59.         }
  60.         std::cout << std::endl;
  61.     }
  62.  
  63.     return 0;
  64. }
Success #stdin #stdout 0.01s 5548KB
comments (?)
stdin
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4
stdout
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Enter the value of n:    	   	 12	 11	
   	   	  9	 10	
  8	  7	  6	  5	
  1	  2	  3	  4
https://ideone.com/SqA8QC
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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