Submission #1309530

#	Time	Username	Problem	Language	Result	Execution time	Memory
1309530		trigon	Souvenirs (IOI25_souvenirs)	C++20	0 / 100	9 ms	332 KiB

souvenirs

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

/*
 The judge provides this function.
 Do NOT define it yourself in the real submission.
*/
pair<vector<int>, long long> transaction(long long M);

void buy_souvenirs(int N, long long P0) {
    vector<long long> Q(N, 0);   // final counts
    vector<long long> Mmin(N, -1); // Mmin[i] = smallest M where type i appears

    /*
      Step 1: For each type i = 1 .. N-1,
      binary search the smallest M such that type i appears.
    */
    for (int i = 1; i < N; i++) {
        long long low = 1;
        long long high = P0 - 1;
        long long ans = -1;

        while (low <= high) {
            long long mid = (low + high) / 2;
            auto res = transaction(mid);
            auto &L = res.first;

            bool found = false;
            for (int x : L) {
                if (x == i) {
                    found = true;
                    break;
                }
            }

            if (found) {
                ans = mid;
                high = mid - 1;  // try smaller M
            } else {
                low = mid + 1;   // need more coins
            }
        }

        Mmin[i] = ans;
    }

    /*
      Step 2: Use the discovered Mmin[i]
      to buy exactly i souvenirs of type i
    */
    for (int i = 1; i < N; i++) {
        for (int k = 0; k < i; k++) {
            auto res = transaction(Mmin[i]);
            for (int x : res.first) {
                Q[x]++;
            }
        }
    }

    /*
      Step 3: Output final counts
    */

}

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