제출 #1285616

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1285616		ecen30	선물 (IOI25_souvenirs)	C++20	큐에 대기중	0 ms	0 KiB

souvenirs

#include <bits/stdc++.h>
using namespace std;
//This is Grok code. I am using this website to test different AI's and their abilities to solve IOI problems. Please understand. I do not mean to cheat. Just trying to get a good grade on my science project.

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

void buy_souvenirs(int N, long long P0) {
    vector<long long> P(N);
    P[0] = P0;

    // Step 1: Discover all prices P[1], P[2], ..., P[N-1] using binary search
    for (int i = 1; i < N; ++i) {
        long long low = 1;
        long long high = P[i - 1] - 1;
        long long found = -1;

        while (low <= high) {
            long long mid = low + (high - low) / 2;

            auto [types, remaining] = transaction(mid);

            // Check if we got any type >= i
            bool got_high = false;
            for (int t : types) {
                if (t >= i) {
                    got_high = true;
                    break;
                }
            }

            if (got_high) {
                // P[i] <= mid
                found = mid;
                high = mid - 1;
            } else {
                // P[i] > mid
                low = mid + 1;
            }
        }

        P[i] = found;
    }

    // Step 2: Buy exactly i souvenirs of type i (for i = 1 to N-1)
    // Using transaction(P[i]) exactly i times gives exactly one type i each time
    for (int i = 1; i < N; ++i) {
        for (int cnt = 0; cnt < i; ++cnt) {
            transaction(P[i]);
        }
    }
}