#define _USE_MATH_DEFINES #include using namespace std; #define FOR(i,m,n) for(int i=(m);i<(n);++i) #define REP(i,n) FOR(i,0,n) #define ALL(v) (v).begin(),(v).end() using ll = long long; constexpr int INF = 0x3f3f3f3f; constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL; constexpr double EPS = 1e-8; constexpr int MOD = 1000000007; // constexpr int MOD = 998244353; constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1}; constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1}; template inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; } template inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; } struct IOSetup { IOSetup() { std::cin.tie(nullptr); std::ios_base::sync_with_stdio(false); std::cout << fixed << setprecision(20); } } iosetup; int main() { int n, m; cin >> n >> m; if (m < n - 1) { cout << "NO\n"; return 0; } int a = 1, b = n / 2, c = n - (a + b); if (m > 1LL * b * (a + c)) { cout << "NO\n"; return 0; } vector u, v; FOR(i, b, n) { u.emplace_back(0); v.emplace_back(i); } FOR(i, 1, b) { u.emplace_back(i); v.emplace_back(b); } for (int i = 1; i < b && u.size() < m; ++i) { for (int j = b + 1; j < n && u.size() < m; ++j) { u.emplace_back(i); v.emplace_back(j); } } cout << "YES\n"; vector ans(n); REP(i, a) ans[b + i] = i; REP(i, c) ans[b + a + i] = a + i; REP(i, b) ans[i] = a + c + i; REP(i, n) cout << ans[i] + 1 << " \n"[i + 1 == n]; REP(i, m) cout << u[i] + 1 << ' ' << v[i] + 1 << '\n'; return 0; }