Submission #811009

#	Time	Username	Problem	Language	Result	Execution time	Memory
811009		WLZ	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	11 ms	1336 KiB

biscuits

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

const long long LINF = (long long) 1e18;

#ifdef DEBUG
#include "../../../templates/debug.h"
#else
#define debug(...) 0
#endif

long long count_tastiness(long long x, std::vector<long long> a) {
  const int k = 62;
  while ((int) a.size() < k) a.push_back(0);
  a.insert(a.begin(), 0ll);
  vector<long long> b = a;
  for (int i = 1; i <= k; i++) b[i] += b[i - 1] / 2;
  b[0] = LINF;
  vector<long long> dp(k + 1, 1); dp[0] = 1;
  for (int i = 1; i <= k; i++) {
    if (b[i] < x) {
      dp[i] = dp[i - 1];
      continue;
    }
    long long taken = max(0ll, x - a[i]) * 2;
    dp[i] = dp[i - 1] + 1;
    for (int j = i - 1; j >= 1; j--) {
      if (b[j] - taken >= x) {
        dp[i] += dp[j - 1];
        taken = (max(0ll, taken + x - a[j])) * 2;
      } else taken = max(0ll, taken - a[j]) * 2;
    }
  }
  return dp[k];
}

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