#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; // Discover P[1] to 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 price = -1; while (low <= high) { long long mid = low + (high - low) / 2; auto [types, rem] = transaction(mid); bool got_i_or_higher = false; for (int t : types) { if (t >= i) { got_i_or_higher = true; break; } } if (got_i_or_higher) { price = mid; high = mid - 1; } else { low = mid + 1; } } P[i] = price; } // Buy exactly i of type i for i=1 to N-1 for (int i = 1; i < N; ++i) { for (int j = 0; j < i; ++j) { transaction(P[i]); } } }