#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main() {
int arr[100][100] = {0};
int n;
int a = 1;
scanf("%d", &n);
for(int i=0; i<n; i++){
if(i % 2 ==0){
for(int j=0; j<n; j++){
arr[i][j] = a++;
}
}else{
for(int j=n-1; j>=0; j--){
arr[i][j] = a++;
}
}
}
for(int i=0; i<n; i++){
for(int j=0; j<n; j++){
printf("%d ", arr[i][j]);
}
printf("\n");
}
return 0;
}
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