제출 #638693

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
638693		slime	비스킷 담기 (IOI20_biscuits)	C++14	0 / 100	1085 ms	340 KiB

biscuits

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

bool check(long long x, long long y, std::vector<long long> a) {

  int k = a.size();
  for(int i=0; i<x; i++) {
    long long w = y;
    for(int j=k-1; j>=0; j--) {
      long long nd = w / (1ll << j);
      nd = min(nd, a[j]);

      a[j] -= nd;
      w -= nd * (1ll << j);
    }
    if(w) return 0;
  }
  return 1;
}

long long count_tastiness(long long x, std::vector<long long> a) {

  long long nxt = -1;
  long long mul = 1;
  long long ans = 1;

  while(1) {
    nxt++;


    if(!check(x, nxt * mul, a)) { // find next perfect power, e.g. 6 -> 8
      long long lg = 64 - __builtin_clzll(nxt) - 1;
      lg = mul * (1ll << (lg + 1)); 
      mul = lg;
      // if [0, 9] ok, 10 not ok, ans *= nxt

      if(nxt == 1) break;
      ans *= nxt;
      nxt = 0;
    }

  }

  ans *= nxt;
  return ans;
}

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