P1996 約瑟夫問題

題目:
https://www.luogu.com.cn/problem/P1996

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#include <bits/stdc++.h>
using namespace std;

struct ListNode{
int val;
ListNode* next = nullptr;
ListNode(int i): val{i}{}
};

int main(){
ios::sync_with_stdio(0);
cin.tie(0);

int n, m;
while(cin >> n >> m){
ListNode* head = nullptr, *last = nullptr;

for(int i=1; i<=n; ++i){
ListNode* newNode = new ListNode(i);

if(head == nullptr){
head = newNode;
}
else{
last->next = newNode;
}
last = newNode;
}

if(last != nullptr) last->next = head;

bool first = true;
ListNode* current = head;
ListNode* pre = last;
for(int count = 1; count <= n; ++count){
if(first) first = false;
else cout << ' ';

for(int i=1; i<m; ++i){
pre = current;
current = current->next;
}
cout << current->val;

pre->next = current->next;
ListNode* tmp = current;
current = current->next;

if(tmp == head) head = current;

delete tmp;
}
cout << '\n';
}

return 0;
}