#661601 (C++17) No.1519 Diversity

• 問題: No.1519 Diversity
• ユーザー: goodbaton
• 提出日時: 2021-05-28 23:10:46
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 85 ms / 2,000 ms
• コード長: 2,170 bytes
• コンパイル時間: 1,333 ms
• コンパイル使用メモリ: 120,056 KB
• 実行使用メモリ: 5,376 KB
• 最終ジャッジ日時: 2024-04-25 00:59:00
• 合計ジャッジ時間: 2,810 ms
• ジャッジサーバーID （参考情報）: judge5 / judge2

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	2 ms; 5,248 KB
testcase_02	AC	2 ms; 5,376 KB
testcase_03	AC	30 ms; 5,376 KB
testcase_04	AC	65 ms; 5,376 KB
testcase_05	AC	2 ms; 5,376 KB
testcase_06	AC	85 ms; 5,376 KB
testcase_07	AC	2 ms; 5,376 KB
testcase_08	AC	13 ms; 5,376 KB
testcase_09	AC	32 ms; 5,376 KB
testcase_10	AC	58 ms; 5,376 KB
testcase_11	AC	2 ms; 5,376 KB
testcase_12	AC	81 ms; 5,376 KB
testcase_13	AC	83 ms; 5,376 KB
testcase_14	AC	85 ms; 5,376 KB
testcase_15	AC	84 ms; 5,376 KB

ソースコード

#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>

#include <algorithm>
#include <bitset>
#include <complex>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

#include <cassert>
#include <functional>

using ll = long long;
using namespace std;

template<typename A, typename B>
bool chmin(A &a, const B b) {
  if (a <= b) return false;
  a = b;
  return true;
}

template<typename A, typename B>
bool chmax(A &a, const B b) {
  if (a >= b) return false;
  a = b;
  return true;
}

#ifndef LOCAL
#define debug(...) ;
#else
#define debug(...) cerr << __LINE__ << " : " << #__VA_ARGS__ << " = " << _tostr(__VA_ARGS__) << endl;

template<typename T>
ostream &operator<<(ostream &out, const vector<T> &v);

template<typename T1, typename T2>
ostream &operator<<(ostream &out, const pair<T1, T2> &p) {
  out << "{" << p.first << ", " << p.second << "}";
  return out;
}

template<typename T>
ostream &operator<<(ostream &out, const vector<T> &v) {
  out << '{';
  for (const T &item : v) out << item << ", ";
  out << "\b\b}";
  return out;
}

void _tostr_rec(ostringstream &oss) {
  oss << "\b\b \b";
}

template<typename Head, typename... Tail>
void _tostr_rec(ostringstream &oss, Head &&head, Tail &&...tail) {
  oss << head << ", ";
  _tostr_rec(oss, forward<Tail>(tail)...);
}

template<typename... T>
string _tostr(T &&...args) {
  ostringstream oss;
  int size = sizeof...(args);
  if (size > 1) oss << "{";
  _tostr_rec(oss, forward<T>(args)...);
  if (size > 1) oss << "}";
  return oss.str();
}
#endif

constexpr int mod = 1'000'000'007; //1e9+7(prime number)
constexpr int INF = 1'000'000'000; //1e9
constexpr ll LLINF = 2'000'000'000'000'000'000LL; //2e18
constexpr int SIZE = 200010;

int main() {
  int N;

  scanf("%d", &N);

  vector<pair<int, int>> ans;

  for (int i = 0; i < N; i++) {
    for (int j = i + 1; j < N - i; j++) {
      ans.push_back({i, j});
    }
  }

  cout << ans.size() << endl;
  for (auto e : ans) {
    cout << e.first + 1 << " " << e.second + 1 << endl;
  }

  return 0;
}