제출 #1258012

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1258012		avighna	선물 (IOI25_souvenirs)	C++20	21 / 100	12 ms	400 KiB

souvenirs

#include <cassert>
#include <utility>
#include <vector>

std::pair<std::vector<int>, long long> transaction(long long M);

void buy_souvenirs(int N, long long P0) {
  std::vector<int> have(N); // for each type we want have[i] == i
  std::vector<long long> a(N);    // retreived array
  a[0] = P0;
  for (int i = 1; i < N; ++i) {
    if (have[i] == i) {
      continue;
    }
    auto [got, rem] = transaction(a[i - 1] - 1); // it can either be -1 or -2
    if (rem == 0) {
      // it was -1, or it could be -2 and the last element is 1
      a[i] = a[i - 1] - 1 - (got.size() > 1 and got.back() == N - 1);
    } else {
      a[i] = a[i - 1] - 2; // it was -2
    }
    for (int &x : got) {
      have[x]++;
    }
    while (have[i] < i) {
      transaction(a[i]);
      have[i]++;
    }
  }
}

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