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#include<bits/stdc++.h>
using namespace std;
struct Node
{
int val;
Node* next;
Node(int x):val(x),next(nullptr){}
};
int main()
{
int N;
cin >> N;
if(N == 1)
{
cout << "1";
return 0;
}
Node* dummy = new Node(0);
Node* cur = dummy;
int i = 1;
while(i <= N)
{
cur->next = new Node(i);
cur = cur->next;
i++;
}
cur->next = dummy->next;
cur = cur->next;
delete dummy;
while(cur->next != cur)...
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