#include <bits/stdc++.h> using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- int N,M; int A[101010]; void solve() { int i,j,k,l,r,x,y; string s; cin>>N>>M; FOR(i,N) A[i]=i+1; vector<pair<int,int>> V; set<pair<int,int>> S; FOR(i,N/2) { V.push_back({i,i+N/2}); S.insert({i,i+N/2}); M--; if(i+N/2+1<N) { V.push_back({i,i+N/2+1}); S.insert({i,i+N/2+1}); M--; } } if(M<0) return _P("NO\n"); FOR(i,N/2) { for(j=N/2;j<N && M;j++) { if(S.count({i,j})==0) { V.push_back({i,j}); S.insert({i,j}); M--; } } } if(M) return _P("NO\n"); cout<<"YES"<<endl; FOR(i,N) { cout<<A[i]; if(i<N-1) cout<<" "; } cout<<endl; FORR(v,V) { cout<<v.first+1<<" "<<v.second+1<<endl; } } int main(int argc,char** argv){ string s;int i; if(argc==1) ios::sync_with_stdio(false), cin.tie(0); FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin); cout.tie(0); solve(); return 0; }