传送门
文章目录
- 题意:
- 思路:
题意:
思路:
紧跟刘爷脚步补题。
不难想到用链表维护下一个数是什么,这样就跟以前做过的一个题差不多了,首先将初始的时候删掉的点的前一个点即为题目中的AAA入队,让后删掉这个点只会影响他之后的一个点,用链表维护一下每个点下一个点在哪里,直接判断就好啦。
// Problem: B. Playlist
// Contest: Codeforces - Codeforces Round #709 (Div. 1, based on Technocup 2021 Final Round)
// URL: https://codeforces.com/problemset/problem/1483/B
// Memory Limit: 256 MB
// Time Limit: 2000 ms
//
// Powered by CP Editor (https://cpeditor.org)//#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4.1,sse4.2,avx,avx2,popcnt,tune=native")
//#pragma GCC optimize(2)
#include<cstdio>
#include<iostream>
#include<string>
#include<cstring>
#include<map>
#include<cmath>
#include<cctype>
#include<vector>
#include<set>
#include<queue>
#include<algorithm>
#include<assert.h>
#include<sstream>
#include<ctime>
#include<cstdlib>
#define X first
#define Y second
#define L (u<<1)
#define R (u<<1|1)
#define pb push_back
#define mk make_pair
#define Mid (tr[u].l+tr[u].r>>1)
#define Len(u) (tr[u].r-tr[u].l+1)
#define random(a,b) ((a)+rand()%((b)-(a)+1))
#define db puts("---")
using namespace std;//void rd_cre() { freopen("d://dp//data.txt","w",stdout); srand(time(NULL)); }
//void rd_ac() { freopen("d://dp//data.txt","r",stdin); freopen("d://dp//AC.txt","w",stdout); }
//void rd_wa() { freopen("d://dp//data.txt","r",stdin); freopen("d://dp//WA.txt","w",stdout); }typedef long long LL;
typedef unsigned long long ULL;
typedef pair<int,int> PII;const int N=1000010,mod=1e9+7,INF=0x3f3f3f3f;
const double eps=1e-6;int n;
int a[N],nt[N],pr[N],st[N];
int cnt[N];
queue<int>q;
vector<int>v;int main()
{
// ios::sync_with_stdio(false);
// cin.tie(0);int _; scanf("%d",&_);while(_--) {scanf("%d",&n);for(int i=0;i<n;i++) st[i]=0,cnt[i]=0;v.clear();for(int i=0;i<n;i++) scanf("%d",&a[i]),nt[i]=(i+1)%n;for(int i=0;i<n;i++) {if(__gcd(a[i],a[(i+1)%n])==1)q.push(i),st[(i+1)%n]=1,nt[i]=nt[nt[i]],v.pb((i+1)%n),i++;}while(q.size()) {int u=q.front(); q.pop();cnt[u]++;if(st[u]) continue;if(__gcd(a[u],a[nt[u]])==1) {v.pb(nt[u]);st[nt[u]]=1;nt[u]=nt[nt[u]];q.push(u);} }int sum=0;//for(int i=1;i<=n;i++) sum+=cnt[i];//assert(sum<=n*4);printf("%d",v.size());for(auto x:v) printf(" %d",x+1);puts("");}return 0;
}
/**/