Saturday, May 25, 2024

# Codeforces Round #411 (Div. 1), problem: (E) The same permutation Solution In C/C++

```#include <stdio.h>
int n;

int main()
{
scanf("%d",&n);
if(n%4>1)return printf("NO\n"),0;
printf("YES\n");
for(int i=1;i<n;i+=4)
{
if(n%4)printf("%d %d\n%d %d\n%d %d\n",i+2,n,i+2,i+3,i+3,n);
else printf("%d %d\n",i+2,i+3);
printf("%d %d\n",i,i+2);
printf("%d %d\n",i+1,i+3);
printf("%d %d\n",i+1,i+2);
printf("%d %d\n",i,i+3);
if(n%4)printf("%d %d\n%d %d\n%d %d\n",i,n,i,i+1,i+1,n);
else printf("%d %d\n",i,i+1);
}
for(int i=1;i<n;i+=4)
for(int j=i+4;j<n;j+=4)
{
printf("%d %d\n",i+3,j+2);
printf("%d %d\n",i+2,j+2);
printf("%d %d\n",i+3,j+1);
printf("%d %d\n",i,j+1);
printf("%d %d\n",i+1,j+3);
printf("%d %d\n",i+2,j+3);
printf("%d %d\n",i+1,j+2);
printf("%d %d\n",i+1,j+1);
printf("%d %d\n",i+3,j);
printf("%d %d\n",i+3,j+3);
printf("%d %d\n",i,j+2);
printf("%d %d\n",i,j+3);
printf("%d %d\n",i+2,j);
printf("%d %d\n",i+2,j+1);
printf("%d %d\n",i+1,j);
printf("%d %d\n",i,j);
}
return 0;
}
```

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