Untitled

#include <stdio.h>
#include <math.h>

int main(){ 
	int  n;
	scanf("%d",&n);
	int a[n];
	for (int i=0;i<n;i++){
		scanf("%d",&a[i]);
	}
	for (int i=0;i<n;i++){
		printf("%d ",a[i]);
	}
	printf("\n");
	for (int i=n-1;i>=0;i--){
		printf("%d ",a[i]);
	}
	printf("\n");
	for (int i=0;i<n;i+=2){
		printf("%d ",a[i]);
	}
	printf("\n");
	for (int i=1;i<n;i+=2){
		printf("%d ",a[i]);
	}
	printf("\n");
	for (int i=1;i<n;i++){
		printf("%d ",a[i]+a[i-1]);
	}
	return 0;
}