algorithms_and_data_structures/Patterns_With_C++/PatternDoubleSidedArrow.cpp at master · prachijaseja/algorithms_and_data_structures · GitHub

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/*

            1
        2 1   1 2
    3 2 1       1 2 3
4 3 2 1           1 2 3 4
    3 2 1       1 2 3
        2 1   1 2
            1

*/

#include<iostream>
using namespace std;
int main() {
    int n;
    cin>>n;
    for(int i=1;i<=(n+1)/2;i++){
        for(int j=1;j<=(2*(n+1-2*i));j++){
            cout<<" ";
        }
        for(int j = i;j>0;j--){
            cout<<j<<" ";
        }

        for(int j=1;j<(4*(i-1)-1);j++){
            cout<<" ";
        }
        if(i>1){
        for(int j=1;j<=i;j++){
            cout<<j<<" ";
        }
    }
        cout<<endl;
    }
    for(int i=n/2;i>0;i--){
         for(int j=1;j<=(2*(n+1-2*i));j++){
            cout<<" ";
        }
        for(int j = i;j>0;j--){
            cout<<j<<" ";
        }

        for(int j=1;j<(4*(i-1)-1);j++){
            cout<<" ";
        }
        if(i>1){
        for(int j=1;j<=i;j++){
            cout<<j<<" ";
        }
        }
        cout<<endl;
    }
	return 0;
}