Submission #1268498

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268498		strange420	Souvenirs (IOI25_souvenirs)	C++20	25 / 100	12 ms	408 KiB

souvenirs

#include "souvenirs.h"
#include <utility>
#include <vector>
#include <iostream>

void buy_souvenirs(int N, long long P0) {
  if (N == 2) {
    // Subtask 1
    transaction(P0 - 1);
  } else if (P0 == N) {
    // Subtask 2
    for (long long i = N-1, k = 1; i>0; i--, k++) {
      for (int j = 0; j < k; j++) {
        transaction(i);
      }
    }
  } else if (N == 3) {
    // Subtask 4
    std::pair<std::vector<int>, long long> res = transaction(P0-1);
    long long price = P0-1-res.second;
    if (res.first.size() == 1) {
      transaction(price-1);
      transaction(price-1);
    } else {
      long long special = price / 2;
      transaction(special);
    }
  } else {
    // Subtask 3
    std::vector<int> cnt(N, 0);
    std::vector<int> price(N, 0);

    long long current_price = P0 - 1;
    while (price[N-1] == 0) {
      std::pair<std::vector<int>, long long> res = transaction(current_price);

      for (auto x: res.first) {
        cnt[x]++;
      }

      if (res.first.size() == 1 && res.second == 0) {
        int i = res.first[0];
        price[i] = current_price;
        current_price --;
      } else {
        int i = res.first[0];
        price[i] = current_price - 1;
        current_price -= 2;
      }
    }

    for (int i=1; i<N; i++) {
      for (int j = cnt[i]; j < i; j++) {
        transaction(price[i]);
      }
    }
  }
}

• Subtask 0: 0 / 0
• Subtask 1: 4 / 4
• Subtask 2: 3 / 3
• Subtask 3: 0 / 14
• Subtask 4: 18 / 18
• Subtask 5: 0 / 28
• Subtask 6: 0 / 33