結果

問題 No.1557 Binary Variable
ユーザー miscalc
提出日時 2021-06-25 21:53:19
言語 C++17(gcc12)
(gcc 12.3.0 + boost 1.87.0)
結果
RE  
実行時間 -
コード長 1,195 bytes
コンパイル時間 6,167 ms
コンパイル使用メモリ 261,464 KB
最終ジャッジ日時 2025-01-22 12:12:36
ジャッジサーバーID
(参考情報)
judge4 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample RE * 3
other AC * 3 RE * 31
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using pll = pair<ll, ll>;
using tlll = tuple<ll, ll, ll>;
//constexpr ll MOD = 1e9 + 7;
constexpr ll MOD = 998244353;
//constexpr ll MOD = ;
ll mod(ll A, ll M) {return (A % M + M) % M;}
constexpr ll INF = 1LL << 60;
template<class T> bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}
template<class T> bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}
ll divceil(ll A, ll B) {return (A + (B - 1)) / B;}
#define FINALANS(A) do {cout << (A) << '\n'; exit(0);} while (false)
int main()
{
ll N, M;
cin >> N >> M;
set<pll> RL;
for (ll i = 0; i < M; i++)
{
ll l, r;
cin >> l >> r;
RL.emplace(make_pair(r, l));
}
/*
for (auto rl : RL)
{
cerr << rl.first << " " << rl.second << endl;
}
//*/
ll ans = 0;
while (!RL.empty())
{
pll rl = *RL.begin();
ll r = rl.first, l = rl.second;
for (auto r0l0 : RL)
{
ll r0 = r0l0.first, l0 = r0l0.second;
if (l0 <= r && r <= r0)
RL.erase(r0l0);
}
ans++;
//cerr << r << " " << l << " " << RL.size() << endl;
}
cout << N - ans << endl;
}
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