結果

問題 No.2543 Many Meetings
ユーザー 👑 amentorimaruamentorimaru
提出日時 2023-11-24 22:15:37
言語 C++23
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 616 ms / 2,000 ms
コード長 4,195 bytes
コンパイル時間 4,430 ms
コンパイル使用メモリ 243,780 KB
実行使用メモリ 52,796 KB
最終ジャッジ日時 2024-09-26 09:27:36
合計ジャッジ時間 16,400 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
このコードへのチャレンジ
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テストケース

テストケース表示
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
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 521 ms
52,672 KB
testcase_04 AC 526 ms
52,796 KB
testcase_05 AC 522 ms
52,672 KB
testcase_06 AC 527 ms
52,592 KB
testcase_07 AC 526 ms
52,584 KB
testcase_08 AC 592 ms
52,796 KB
testcase_09 AC 589 ms
52,668 KB
testcase_10 AC 616 ms
52,612 KB
testcase_11 AC 596 ms
52,796 KB
testcase_12 AC 592 ms
52,716 KB
testcase_13 AC 378 ms
43,288 KB
testcase_14 AC 200 ms
25,676 KB
testcase_15 AC 189 ms
25,356 KB
testcase_16 AC 314 ms
35,020 KB
testcase_17 AC 362 ms
41,388 KB
testcase_18 AC 432 ms
45,680 KB
testcase_19 AC 388 ms
42,088 KB
testcase_20 AC 397 ms
42,560 KB
testcase_21 AC 469 ms
48,392 KB
testcase_22 AC 382 ms
41,392 KB
testcase_23 AC 4 ms
5,376 KB
testcase_24 AC 2 ms
5,376 KB
testcase_25 AC 2 ms
5,376 KB
testcase_26 AC 2 ms
5,376 KB
testcase_27 AC 3 ms
5,376 KB
testcase_28 AC 339 ms
40,652 KB
testcase_29 AC 102 ms
15,580 KB
testcase_30 AC 106 ms
15,744 KB
testcase_31 AC 85 ms
13,804 KB
testcase_32 AC 307 ms
38,408 KB
testcase_33 AC 2 ms
5,376 KB
testcase_34 AC 2 ms
5,376 KB
testcase_35 AC 2 ms
5,376 KB
testcase_36 AC 2 ms
5,376 KB
testcase_37 AC 2 ms
5,376 KB
testcase_38 AC 2 ms
5,376 KB
testcase_39 AC 2 ms
5,376 KB
testcase_40 AC 2 ms
5,376 KB
testcase_41 AC 2 ms
5,376 KB
testcase_42 AC 2 ms
5,376 KB
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 #

#define ATCODER
#define _USE_MATH_DEFINES
#include<stdio.h>
#include<iostream>
#include<fstream>
#include<algorithm>
#include<vector>
#include<string>
#include <cassert>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <queue>
#include <math.h>
#include <climits>
#include <set>
#include <map>
#include <list>
#include <random>
#include <iterator>
#include <bitset>
#include <chrono>

using namespace std;

using ll = long long;
using ld = long double;
using pll = pair<ll, ll>;
using pdd = pair<ld, ld>;

//template<class T> using pq = priority_queue<T, vector<T>, greater<T>>;

#define FOR(i, a, b) for(ll i=(a); i<(b);i++)
#define REP(i, n) for(ll i=0; i<(n);i++)
#define ROF(i, a, b) for(ll i=(b-1); i>=(a);i--)
#define PER(i, n) for(ll i=n-1; i>=0;i--)
#define REPREP(i,j,a,b) for(ll i=0;i<a;i++)for(ll j=0;j<b;j++)
#define VV(type) vector< vector<type> >
#define VV2(type,n,m,val) vector< vector<type> > val;val.resize(n);for(ll i;i<n;i++)val[i].resize(m)
#define vec(type) vector<type>
#define VEC(type,n,val) vector<type> val;val.resize(n)
#define VL vector<ll>
#define VVL vector< vector<ll> >
#define VP vector< pair<ll,ll> >
#define SZ size()
#define all(i) begin(i),end(i)
#define SORT(i) sort(all(i))
#define BITI(i) (1<<i)
#define BITSET(x,i) x | (ll(1)<<i)
#define BITCUT(x,i) x & ~(ll(1)<<i)
#define EXISTBIT(x,i) (((x>>i) & 1) != 0)
#define ALLBIT(n) (ll(1)<<n-1)
#define CHMAX(n,v) n=n<v?v:n
#define CHMIN(n,v) n=n>v?v:n
#define MP(a,b) make_pair(a,b)
#define DET2(x1,y1,x2,y2) x1*y2-x2*y1
#define DET3(x1,y1,z1,x2,y2,z2,x3,y3,z3) x1*y2*z3+x2*y3*z1+x3*y1*z2-z1*y2*x3-z2*y3*x1-z3*y1*x2
#define INC(a) for(auto& v:a)v++;
#define DEC(a) for(auto& v:a)v--;
#define SQU(x) (x)*(x)
#define L0 ll(0)
#ifdef ATCODER
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using mint2 = modint998244353;
#endif
template<typename T = ll>
vector<T> read(size_t n) {
  vector<T> ts(n);
  for (size_t i = 0; i < n; i++) cin >> ts[i];
  return ts;
}

template<typename TV, const ll N> void read_tuple_impl(TV&) {}
template<typename TV, const ll N, typename Head, typename... Tail>
void read_tuple_impl(TV& ts) {
  get<N>(ts).emplace_back(*(istream_iterator<Head>(cin)));
  read_tuple_impl<TV, N + 1, Tail...>(ts);
}
template<typename... Ts> decltype(auto) read_tuple(size_t n) {
  tuple<vector<Ts>...> ts;
  for (size_t i = 0; i < n; i++) read_tuple_impl<decltype(ts), 0, Ts...>(ts);
  return ts;
}

using val = ll;
using func = ll;

val op(val a, val b) { return min(a, b); }
val e() { return 1e18; }


//val mp(func f, val a) {
//  return MP(a.first + f * a.second, a.second);
//}
func comp(func f, func g) {
  return f + g;
}
func id() { return 0; }

ll di[4] = { 1,0,-1,0 };
ll dj[4] = { 0,1,0,-1 };
ll si[4] = { 0,3,3,0 };
ll sj[4] = { 0,0,3,3 };
//ll di[4] = { -1,-1,1,1 };
//ll dj[4] = { -1,1,-1,1 };
ll di8[8] = { 0,-1,-1,-1,0,1,1,1 };
ll dj8[8] = { -1,-1,0,1,1,1,0,-1 };

ll s;
bool f(val v) {
  return v <= s;
}

void solve() {
  ll n, k;
  cin >> n >> k;
  auto [l, r] = read_tuple<ll, ll>(n);
  VP lr(n);
  REP(i, n)
    lr[i] = MP(l[i], r[i]);
  SORT(lr);
  segtree<val, op, e> st(n);
  REP(i, n)
    st.set(i, lr[i].second);
  VVL p(n, vector<ll>(20, -1));
  REP(i, n) {
    auto il = lower_bound(all(lr), MP(lr[i].second, 0LL));
    if (il == lr.end())
      continue;
    ll id = il - lr.begin();
    ll mn = st.prod(id, n);
    ll l1 = id, r1 = n;
    while (l1 + 1 < r1) {
      ll m = (l1 + r1) / 2;
      ll mn1 = st.prod(id, m);
      if (mn == mn1) {
        r1 = m;
      }
      else {
        l1 = m;
      }
    }
    p[i][0] = l1;
  }
  REP(i, 19) {
    REP(v, n) {
      if (p[v][i] == -1)
        continue;
      p[v][i + 1] = p[p[v][i]][i];
    }
  }
  ll ans = 1e18;
  k--;
  REP(v, n) {
    ll kk = k;
    ll now = v;
    PER(i, 20) {
      ll up = 1LL << i;
      if (kk >= up) {
        now = p[now][i];
        kk -= up;
      }
      if (now == -1)
        break;
    }
    if (now == -1)
      continue;
    CHMIN(ans, lr[now].second - lr[v].first);
  }
  if (ans > 1e17)
    ans = -1;
  cout << ans;
  return;
}

int main() {
  ll t = 1;
  ///cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}

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