Submission #71661335

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#define debug(arg) cout << "[" << #arg << "]: " << arg << endl
#else
#define debug(arg) 42
#endif

using llu = uint64_t;
using ll = int64_t;

#define vec vector
#define pb push_back
#define all(n) begin(n), end(n)

void solv() {
	int n; cin >> n;
	vec<vec<int>> mat(n, vec<int>(n));
	int r = 0, c = (n - 1)/2;
	mat[r][c] = 1;
	for (int i = 1; i < n*n; ++i) {
		int nr, nc;
		nr = (n + r - 1)%n, nc = (c + 1)%n;
		if (mat[nr][nc]) nr = (r + 1)%n, nc = c;
		r = nr, c = nc;
		mat[r][c] = i + 1;
	}
	for (auto &v : mat) {
		for (auto &i : v) cout << i << ' ';
		cout << '\n';
	}
}

signed main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int t = 1;
	//cin >> t;
	while (t--) solv();
	return 0;
}

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