#include #include using namespace std; #define DEBUG(x) cerr<<#x<<": "< #define vl vector #define vii vector< vector > #define vll vector< vector > #define vs vector #define pii pair #define pis pair #define psi pair #define pll pair template pair operator+(const pair &s, const pair &t) { return pair(s.first + t.first, s.second + t.second); } template pair operator-(const pair &s, const pair &t) { return pair(s.first - t.first, s.second - t.second); } template ostream& operator<<(ostream& os, pair p) { os << "(" << p.first << ", " << p.second << ")"; return os; } #define X first #define Y second #define rep(i,n) for(int i=0;i<(n);i++) #define rep1(i,n) for(int i=1;i<=(n);i++) #define rrep(i,n) for(int i=(n)-1;i>=0;i--) #define rrep1(i,n) for(int i=(n);i>0;i--) #define REP(i,a,b) for(int i=a;i bool chmax(T &a, const T &b) { if (a bool chmin(T &a, const T &b) { if (a>b) { a = b; return 1; } return 0; } #define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end()); const ll inf = 1000000001; const ll INF = (ll)1e18 + 1; const double pi = 3.14159265358979323846; #define Sp(p) cout< 3) { rep (i, k) { a[i].push_back(nex--); n--; } rrep (i, k) { a[i].push_back(nex--); n--; } m -= 2; } int one = n * (n + 1) / 2 / k; rep (i, k) { a[i].push_back(i + 1); } int idx = one - (2 * k + 2*k + 1); int i = idx - 1; rep (_, k) { a[i].push_back(2*k + 1 + _); i++; i %= k; } rep (i, k) { a[i].push_back(one - a[i][a[i].size() - 1] - a[i][a[i].size() - 2]); } rep (i, k) { rep (j, a[i].size()) { cout << a[i][j] << " "; } cout << endl; } } signed main() { ll n, k; cin >> n >> k; if (n % k != 0) { cout << "No" << endl; return 0; } if ((n * (n + 1) / 2) % k != 0) { cout << "No" << endl; return 0; } if ((n / k) % 2 == 0) { solve1(n, k); } else { solve2(n, k); } }