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  1. #include <iostream>
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4.  
  5. void printPattern(int n) {
  6.     int num = 1;
  7.     vector<vector<int>>matrix(n,vector<int>(n,0));
  8.     int i=n-1,j=0;
  9.     bool check=false;
  10.     int limit=n*(n+1)/2;
  11.     while(true){
  12.  
  13.         matrix[i][j]=num++;
  14.         if(num>limit)break;
  15.         if(!check){
  16.             if(i==n-1){
  17.                 j++;
  18.                 check=true;
  19.             }else{
  20.                 i++;
  21.                 j++;
  22.             }
  23.         }else{
  24.             if(j==0){
  25.                 i--;
  26.                 check=false;
  27.             }else{
  28.                 i--;
  29.                 j--;
  30.             }
  31.         }
  32.     }
  33.  
  34.     for(int i=0;i<n;i++){
  35.          for(int j=0;j<n;j++){
  36.             if(matrix[i][j]==0)cout<<" "<<"\t";
  37.             else cout<<matrix[i][j]<<"\t";
  38.          }
  39.          cout<<endl;
  40.     }
  41. }
  42.  
  43.  
  44. int main() {
  45.     int n;
  46.     cout << "Enter the value of n: ";
  47.     cin >> n;
  48.  
  49.     printPattern(n);
  50.  
  51.     return 0;
  52. }
Success #stdin #stdout 0.01s 5520KB
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stdin
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4
stdout
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Enter the value of n: 10	 	 	 	
4	9	 	 	
3	5	8	 	
1	2	6	7
https://ideone.com/8VUoX6
language:
C++14 (gcc 8.3)
created:
311 days ago
visibility:
public

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