#include <bits/stdc++.h> static inline int64_t M = 9ull; extern std::pair<std::vector<int>, long long> transaction(long long M); static void buy_souvenirs(int N, long long P0) { std::vector<int32_t> bought(N, 0); for(int32_t type = 0; type < N; type++) { while(bought[type] < type) { for(int64_t M = 1; M < P0; M++) { auto transactions = transaction(M); auto& L = transactions.first(); if(static_cast<int32_t>(L.size()) == 1 && L[0] == type) { bought[type]++; break; } } } } } int main() { buy_souvenirs(3, 4) }

souvenirs.cpp: In function 'void buy_souvenirs(int, long long int)':
souvenirs.cpp:15:37: error: no match for call to '(std::vector<int>) ()'
   15 |         auto& L = transactions.first();
      |                   ~~~~~~~~~~~~~~~~~~^~
souvenirs.cpp: In function 'int main()':
souvenirs.cpp:28:22: error: expected ';' before '}' token
   28 |   buy_souvenirs(3, 4)
      |                      ^
      |                      ;
   29 | }
      | ~