Submission #1319404

#	Time	Username	Problem	Language	Result	Execution time	Memory
1319404		Trisanu_Das	Souvenirs (IOI25_souvenirs)	C++20	Compilation error	0 ms	0 KiB

souvenirs

#include <vector>
#include <utility>
using namespace std;

void buy_souvenirs(int N, long long P0) {
    vector<long long> P(N);
    P[0] = P0;
    
    // Step 1: Determine all prices using the structure of subtask 3
    for (int i = 0; i < N - 1; ++i) {
        auto result = transaction(P[i] - 1);
        vector<int> bought = result.first;
        long long change = result.second;
        
        if (bought.size() == 1 && bought[0] == i + 1 && change == 0) {
            // d_i = 1
            P[i + 1] = P[i] - 1;
        } else if (bought.size() == 1 && bought[0] == i + 1 && change == 1) {
            // d_i = 2
            P[i + 1] = P[i] - 2;
        } else if (bought.size() == 2 && bought[0] == i + 1 && bought[1] == i + 2 && change == 0) {
            // d_i = 2 and P[i+2] = 1
            P[i + 1] = P[i] - 2;
            if (i + 2 < N) {
                P[i + 2] = 1;
            }
        } else {
            // Fallback (should not happen in subtask 3)
            if (change == 0) {
                P[i + 1] = P[i] - 1;
            } else {
                P[i + 1] = P[i] - 2;
            }
        }
    }
    
    // Step 2: Compute differences for pairing
    vector<int> diff(N - 1);
    for (int i = 0; i < N - 1; ++i) {
        diff[i] = P[i] - P[i + 1];
    }
    
    // Array of needed souvenirs (type 0 is not needed)
    vector<int> need(N, 0);
    for (int i = 1; i < N; ++i) {
        need[i] = i;
    }
    
    // Step 3: Pair type i with type N-1 when possible
    if (P[N - 1] == 1) {
        for (int i = 1; i <= N - 2; ++i) {
            while (need[i] > 0 && need[N - 1] > 0 && diff[i - 1] == 2) {
                transaction(P[i] + 1);
                need[i]--;
                need[N - 1]--;
            }
        }
    }
    
    // Step 4: Buy remaining souvenirs individually
    for (int i = 1; i < N; ++i) {
        while (need[i] > 0) {
            transaction(P[i]);
            need[i]--;
        }
    }
}

Compilation message (stderr)

souvenirs.cpp: In function 'void buy_souvenirs(int, long long int)':
souvenirs.cpp:11:23: error: 'transaction' was not declared in this scope
   11 |         auto result = transaction(P[i] - 1);
      |                       ^~~~~~~~~~~
souvenirs.cpp:53:17: error: 'transaction' was not declared in this scope
   53 |                 transaction(P[i] + 1);
      |                 ^~~~~~~~~~~
souvenirs.cpp:63:13: error: 'transaction' was not declared in this scope
   63 |             transaction(P[i]);
      |             ^~~~~~~~~~~