mirror of
https://git.sb/baoshuo/OI-codes.git
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75 lines
1.6 KiB
C++
75 lines
1.6 KiB
C++
// #include <iostream>
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#include <fstream>
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// using std::cin;
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// using std::cout;
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std::ifstream cin("stone.in");
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std::ofstream cout("stone.out");
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const char endl = '\n';
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int n;
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n;
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if (n == 1) {
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cout << "YES" << endl
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<< 1 << ' ' << 1 << endl;
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} else if (n % 4 == 0) {
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int k = n / 4;
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cout << "YES" << endl;
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for (int i = 1; i <= k; i++) {
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cout << i << ' ' << n - i + 1 << endl;
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}
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for (int i = k + 1; i <= 2 * k - 1; i++) {
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cout << i << ' ' << n - i << endl;
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}
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cout << 2 * k << ' ' << 1 << endl;
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for (int i = 2 * k + 1; i <= 3 * k - 1; i++) {
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cout << i << ' ' << n - i + 1 << endl;
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}
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cout << 3 * k << ' ' << n - k << endl;
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for (int i = 3 * k + 1; i <= 4 * k; i++) {
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cout << i << ' ' << n - i + 2 << endl;
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}
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} else if (n % 4 == 1) {
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int k = n / 4;
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cout << "YES" << endl;
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for (int i = 1; i <= k; i++) {
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cout << i << ' ' << n - i + 1 << endl;
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}
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cout << k + 1 << ' ' << k + 2 << endl;
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for (int i = k + 2; i <= 2 * k; i++) {
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cout << i << ' ' << n - i + 2 << endl;
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}
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cout << 2 * k + 1 << ' ' << 1 << endl;
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for (int i = 2 * k + 2; i <= 3 * k + 1; i++) {
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cout << i << ' ' << n - i + 3 << endl;
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}
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for (int i = 3 * k + 2; i <= 4 * k + 1; i++) {
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cout << i << ' ' << n - i + 2 << endl;
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}
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} else {
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cout << "NO" << endl;
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}
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return 0;
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}
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