제출 #1337800

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1337800		playeragp	선물 (IOI25_souvenirs)	C++20	0 / 100	12 ms	344 KiB

souvenirs

#include <vector>
#include <numeric>
#include <algorithm>

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

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

    for (int i = 1; i < N; ++i) {
        long long low = 1, high = P[i - 1] - 1;
        long long current_P = 1;
        while (low <= high) {
            long long mid = low + (high - low) / 2;
            auto res = transaction(mid);
            bool found_smaller = false;
            for (int type : res.first) {
                if (type < i) {
                    found_smaller = true;
                    break;
                }
            }

            if (found_smaller) {
                high = mid - 1;
            } else {
                current_P = mid / (long long)res.first.size();
                low = mid + 1;
            }
        }
        
        long long L = 1, R = P[i-1] - 1;
        while(L <= R) {
            long long mid = L + (R - L) / 2;
            auto res = transaction(mid);
            int best_type = res.first[0];
            if (best_type < i) {
                R = mid - 1;
            } else if (best_type > i) {
                L = mid + 1;
            } else {
                P[i] = mid - res.second;
                break;
            }
        }
    }

    for (int i = 1; i < N; ++i) {
        for (int j = 0; j < i; ++j) {
            transaction(P[i]);
        }
    }
}

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