Submission #1249882

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249882		canadavid1	Souvenirs (IOI25_souvenirs)	C++20	0 / 100	0 ms	400 KiB

souvenirs

#include "souvenirs.h"
#include <cstdlib>
#include <vector>
#include <utility>
/*
    have to query > P0-N for first
    

    N=3:
        query p-1
            only 1:
                know price, ans that-1 twice
            both:
                know sum, ans half (round down)
*/

void buy_souvenirs(int N, long long P0) {
    if (N != 3) {
        exit(8);
    }

    // auto test = [&](long long M){
    //     auto[o,r] = transaction(M);
    //     for(auto i : o) ct[i]++;
    //     return std::pair{o,r};
    // };
    auto[o,r] = transaction(P0-1);
    if (o.size() == 1) {
        int P1 = P0-1-r;
        transaction(P1-1);
        transaction(P1-1);
    }
    else {
        int P12 = P0-1-r;
        transaction(P12/2);
    }
    
}

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• Subtask 4: 0 / 18
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• Subtask 6: 0 / 33