Submission #1078966

#TimeUsernameProblemLanguageResultExecution timeMemory
1078966Gromp15Rarest Insects (IOI22_insects)C++17
70.61 / 100
105 ms1188 KiB
#include <bits/stdc++.h> #define sz(x) (int)x.size() #define all(x) x.begin(), x.end() #include "insects.h" using namespace std; template<typename T> bool ckmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; } template<typename T> bool ckmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; } int min_cardinality(int N) { vector<int> idx(N); iota(all(idx), 0); shuffle(all(idx), mt19937(1498371)); vector<int> groups{idx[0]}; move_inside(idx[0]); for (int i = 1; i < N; i++) { move_inside(idx[i]); if (press_button() > 1) move_outside(idx[i]); else groups.push_back(idx[i]); } for (int x : groups) move_outside(x); int ans = 1e9; auto solve = [&](auto&& s, vector<int> v, vector<int> pot) -> void { if (sz(v) == 1) { ckmin(ans, sz(pot)); return; } if (sz(v) * sz(v) < sz(pot) * 2) { vector<int> hf(v.begin(), v.begin() + sz(v) / 2), other(v.begin() + sz(v) / 2, v.end()); for (int x : hf) move_inside(x); vector<int> A, B; for (int x : pot) { if (find(all(hf), x) != hf.end()) A.emplace_back(x); else { move_inside(x); if (press_button() > 1) { A.emplace_back(x); } else { B.emplace_back(x); } move_outside(x); } } for (int x : hf) move_outside(x); s(s, hf, A); s(s, other, B); return; } int l = 2, r = sz(pot) / sz(v), ans2 = 1; while (l <= r) { int mid = (l+r)/2; vector<int> got; for (int x : pot) { move_inside(x); if (press_button() > mid) move_outside(x); else got.push_back(x); } if (sz(got) == mid * sz(v)) ans2 = mid, l = mid+1; else r = mid-1; for (int x : got) move_outside(x); } ckmin(ans, ans2); }; solve(solve, groups, idx); return ans; }
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