Submission #828593

#	Time	Username	Problem	Language	Result	Execution time	Memory
828593		erray	Packing Biscuits (IOI20_biscuits)	C++17	12 / 100	1112 ms	799396 KiB

biscuits

#include "biscuits.h"

#include <bits/stdc++.h>

using namespace std;

#ifdef DEBUG
  #include "/home/eagle/ioi20/d2/debug.h"
#else 
  #define debug(...) void(37)
#endif

long long count_tastiness(long long X, std::vector<long long> A) {
  int K = 60;
  A.resize(60);
  for (int i = 0; i < K - 1; ++i) {
    long long carry = max(0LL, (A[i] - X) / 2);
    A[i] -= 2 * carry;
    A[i + 1] += carry;
  }
  A.back() = min(A.back(), X);

  debug(A);
  vector<vector<long long>> ways(K, vector<long long>(K));
  for (int i = K - 1; i >= 0; --i) {
    if (A[i] >= X) {
      continue;
    }
    debug(i);
    vector<long long> states;
    states.push_back((1LL << i) * X);
    for (int j = i; j >= 0; --j) {
      debug(j, states);
      vector<long long> new_states;
      for (auto x : states) {
        long long dec = (1LL << j) * A[j];
        if (dec >= x) {
          ways[i][j] += 1;
          dec -= x;
          if (true) {
            new_states.push_back((2LL << j) * X - dec);
          }
          if (dec == (1LL << j) * X) {
            //assert(dec == (1LL << j));
            ways[i][j] += 1;
          } else {
            new_states.push_back((1LL << j) * X - dec);
          }
        } else {
          new_states.push_back(x - dec);
        }
      }
      swap(states, new_states);
    }
  }
  debug(ways);
  vector<long long> dp(K);
  long long prev = 1;
  for (int i = K - 1; i >= 0; --i) {
    debug(prev, dp);
    if (A[i] >= X) {
      prev = prev * 2 + dp[i];
      continue;
    }
    for (int j = i; j >= 0; --j) {
      dp[j] += prev * ways[i][j];
    }
    prev += dp[i];
  }
  debug(prev);
  return prev;
}

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