CODE FESTIVAL 2016 Final

Submission #5539137

Source codeソースコード

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;

template<class T> struct ConvexHullTrick {
  struct Line { T a, b; };
  deque<Line> deq;
  bool monotone_query;
  bool need(const Line& l, const Line& m, const Line& r) const {
    return m.b * (r.a - l.a) > l.b * (r.a - m.a) + r.b * (m.a - l.a);
  }
  ConvexHullTrick(bool monotone_query = false) : monotone_query(monotone_query) {}
  void add(T a, T b) {
    if (deq.empty() or a < deq[0].a) {
      while (deq.size() >= 2 and !need({a, b}, deq[0], deq[1])) {
        deq.pop_front();
      }
      deq.emplace_front(Line{a, b});
    } else if (a > deq.back().a) {
      while (deq.size() >= 2 and !need(deq[deq.size() - 2], deq.back(), {a, b})) {
        deq.pop_back();
      }
      deq.emplace_back(Line{a, b});
    } else assert(false);
  }
  T max(T x) {
    if (deq.empty()) return numeric_limits<T>::min(); // オーバーフローに注意
    if (monotone_query) {
      while (deq.size() >= 2 and deq[0].a * x + deq[0].b <= deq[1].a * x + deq[1].b) {
        deq.pop_front();
      }
      return deq[0].a * x + deq[0].b;
    }
    int ok = 0, ng = deq.size();
    while (ng - ok > 1) {
      int m = ok + ng >> 1;
      (deq[m - 1].a * x + deq[m - 1].b <= deq[m].a * x + deq[m].b ? ok : ng) = m;
    }
    return deq[ok].a * x + deq[ok].b;
  }
};

int main() {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  lint n, a; cin >> n >> a;
  if (a < 2e6) {
    V<lint> dp;
    ConvexHullTrick<__int128> cht(true);
    for (int x = 0; ; ++x) {
      dp.push_back(x);
      if (a + 2 < x) {
        cht.add(dp[x - 1 - a], (1 - x) * dp[x - 1 - a]);
        dp[x] = max<lint>(dp[x], cht.max(x));
      }
      if (dp[x] >= n) {
        cout << x << '\n';
        return 0;
      }
    }
  }
  lint res = n;
  for (lint x = sqrt(n) - 2; x <= sqrt(n) + 2; ++x) {
    if (x < 2 or x >= n) continue;
    res = min(res, x + a + (n + x - 1) / x);
  }
  cout << res << '\n';
}

Submission

Task問題 E - Cookies
User nameユーザ名 risujiroh
Created time投稿日時
Language言語 C++14 (GCC 5.4.1)
Status状態 AC
Score得点 1000
Source lengthソースコード長 2107 Byte
File nameファイル名
Exec time実行時間 132 ms
Memory usageメモリ使用量 64736 KB

Test case

Set

Set name Score得点 / Max score Cases
sample - sample-01.txt,sample-02.txt,sample-03.txt
dataset1 500 / 500 sample-01.txt,01-01.txt,01-02.txt,01-03.txt,01-04.txt,01-05.txt,01-06.txt,01-07.txt,01-08.txt,01-09.txt,01-10.txt,01-11.txt,01-12.txt,01-13.txt,01-14.txt,01-15.txt,01-16.txt,01-17.txt,01-18.txt,01-19.txt,01-20.txt,01-21.txt,01-22.txt,01-23.txt,01-24.txt,01-25.txt,01-26.txt
dataset2 500 / 500 sample-01.txt,sample-02.txt,sample-03.txt,01-01.txt,01-02.txt,01-03.txt,01-04.txt,01-05.txt,01-06.txt,01-07.txt,01-08.txt,01-09.txt,01-10.txt,01-11.txt,01-12.txt,01-13.txt,01-14.txt,01-15.txt,01-16.txt,01-17.txt,01-18.txt,01-19.txt,01-20.txt,01-21.txt,01-22.txt,01-23.txt,01-24.txt,01-25.txt,01-26.txt,02-01.txt,02-02.txt,02-03.txt,02-04.txt,02-05.txt,02-06.txt,02-07.txt,02-08.txt,02-09.txt,02-10.txt,02-11.txt,02-12.txt,02-13.txt,02-14.txt,02-15.txt,02-16.txt,02-17.txt,02-18.txt,02-19.txt,02-20.txt,02-21.txt,02-22.txt,02-23.txt,02-24.txt,02-25.txt,02-26.txt,02-27.txt,02-28.txt,02-29.txt,02-30.txt,02-31.txt,02-32.txt,02-33.txt,02-34.txt,02-35.txt,02-36.txt,02-37.txt,02-38.txt,02-39.txt,02-40.txt,sample-01.txt,sample-02.txt,sample-03.txt

Test case

Case name Status状態 Exec time実行時間 Memory usageメモリ使用量
01-01.txt AC 1 ms 256 KB
01-02.txt AC 1 ms 256 KB
01-03.txt AC 1 ms 256 KB
01-04.txt AC 1 ms 256 KB
01-05.txt AC 1 ms 256 KB
01-06.txt AC 1 ms 256 KB
01-07.txt AC 1 ms 256 KB
01-08.txt AC 1 ms 256 KB
01-09.txt AC 1 ms 256 KB
01-10.txt AC 1 ms 256 KB
01-11.txt AC 1 ms 256 KB
01-12.txt AC 9 ms 9068 KB
01-13.txt AC 9 ms 9836 KB
01-14.txt AC 1 ms 256 KB
01-15.txt AC 1 ms 256 KB
01-16.txt AC 1 ms 256 KB
01-17.txt AC 1 ms 256 KB
01-18.txt AC 1 ms 256 KB
01-19.txt AC 1 ms 256 KB
01-20.txt AC 1 ms 256 KB
01-21.txt AC 1 ms 256 KB
01-22.txt AC 1 ms 256 KB
01-23.txt AC 1 ms 256 KB
01-24.txt AC 1 ms 256 KB
01-25.txt AC 1 ms 256 KB
01-26.txt AC 1 ms 256 KB
02-01.txt AC 1 ms 256 KB
02-02.txt AC 1 ms 256 KB
02-03.txt AC 1 ms 256 KB
02-04.txt AC 1 ms 256 KB
02-05.txt AC 1 ms 256 KB
02-06.txt AC 1 ms 256 KB
02-07.txt AC 1 ms 256 KB
02-08.txt AC 1 ms 256 KB
02-09.txt AC 1 ms 256 KB
02-10.txt AC 1 ms 256 KB
02-11.txt AC 1 ms 256 KB
02-12.txt AC 1 ms 256 KB
02-13.txt AC 1 ms 256 KB
02-14.txt AC 1 ms 256 KB
02-15.txt AC 1 ms 256 KB
02-16.txt AC 1 ms 256 KB
02-17.txt AC 1 ms 256 KB
02-18.txt AC 1 ms 256 KB
02-19.txt AC 1 ms 384 KB
02-20.txt AC 2 ms 512 KB
02-21.txt AC 5 ms 1784 KB
02-22.txt AC 132 ms 64736 KB
02-23.txt AC 1 ms 256 KB
02-24.txt AC 1 ms 256 KB
02-25.txt AC 1 ms 256 KB
02-26.txt AC 1 ms 256 KB
02-27.txt AC 1 ms 256 KB
02-28.txt AC 1 ms 256 KB
02-29.txt AC 1 ms 256 KB
02-30.txt AC 1 ms 256 KB
02-31.txt AC 1 ms 256 KB
02-32.txt AC 1 ms 256 KB
02-33.txt AC 1 ms 256 KB
02-34.txt AC 1 ms 256 KB
02-35.txt AC 1 ms 256 KB
02-36.txt AC 1 ms 256 KB
02-37.txt AC 1 ms 384 KB
02-38.txt AC 2 ms 640 KB
02-39.txt AC 56 ms 29284 KB
02-40.txt AC 1 ms 256 KB
sample-01.txt AC 1 ms 256 KB
sample-02.txt AC 1 ms 256 KB
sample-03.txt AC 1 ms 256 KB