Submission #669853

#	Time	Username	Problem	Language	Result	Execution time	Memory
669853		evenvalue	Packing Biscuits (IOI20_biscuits)	C++17	21 / 100	1088 ms	50548 KiB

biscuits

//#include "biscuits.h"
#include <bits/stdc++.h>
using namespace std;

template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using max_heap = priority_queue<T, vector<T>, less<T>>;

using int64 = long long;
using ld = long double;

constexpr int kInf = 1e9 + 10;
constexpr int64 kInf64 = 1e15 + 10;
constexpr int kMod = 1e9 + 7;
constexpr int kBits = 60;

void merge_biscuits(const int64 x, vector<int64> &biscuits) {
  while (biscuits.size() <= kBits) biscuits.push_back(0);
  for (int i = 0; i < kBits; i++) {
    const int64 carry = max(0LL, biscuits[i] - x) / 2;
    biscuits[i] -= 2 * carry;
    biscuits[i + 1] += carry;
  }
}

int64 count_tastiness(int64 x, vector<int64> biscuits) {
  merge_biscuits(x, biscuits);

  map<pair<int64, int>, int64> memo;
  memo[{0, kBits}] = 1;
  function<int64(int64, int)> dp = [&](const int64 n, const int i) -> int64 {
    if (memo[{n, i}] != 0) return memo[{n, i}];
    if (biscuits[i] + n < x) return memo[{n, i}] = dp((biscuits[i] + n) / 2, i + 1);
    return memo[{n, i}] = dp((biscuits[i] + n) / 2, i + 1) + dp((biscuits[i] + n - x) / 2, i + 1);
  };

  return dp(0, 0);

}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 21
• Subtask 4: 0 / 35
• Subtask 5: 0 / 23