제출 #464583

#제출 시각아이디문제언어결과실행 시간메모리
464583pikel_rikAliens (IOI16_aliens)C++17
0 / 100
0 ms204 KiB
#include <bits/stdc++.h> using namespace std; long long take_photos(int n, int m, int k, vector<int> r, vector<int> l) { for (int i = 0; i < n; i++) { if (r[i] < l[i]) { swap(r[i], l[i]); } } vector<int> ind(n); iota(ind.begin(), ind.end(), 0); sort(ind.begin(), ind.end(), [&](int i, int j) { return l[i] < l[j] || (l[i] == l[j] && r[i] > r[j]); }); int mx = INT_MIN; ind.erase(remove_if(ind.begin(), ind.end(), [&](int i) { if (r[i] <= mx) { return true; } else { mx = r[i]; return false; } }), ind.end()); int sz = (int) ind.size(); sort(ind.begin(), ind.end(), [&](int i, int j) { return r[i] < r[j]; }); k = min(k, sz); vector<pair<long long, long long>> lines; auto add_line = [&](long long m, long long c) -> void { while (lines.size() > 1) { auto [m1, c1] = lines[(int) lines.size() - 1]; auto [m2, c2] = lines[(int) lines.size() - 2]; //(c - c2) / (m2 - m) >= (c1 - c2) / (m2 - m1) if ((c - c2) * (m2 - m1) >= (c1 - c2) * (m2 - m)) { lines.pop_back(); } else { break; } } lines.emplace_back(m, c); }; auto query = [&](long long x) -> long long { int lo = 0, hi = (int) lines.size() - 1; while (lo < hi) { int mid = lo + (hi - lo) / 2; auto [m1, c1] = lines[mid]; auto [m2, c2] = lines[mid + 1]; //x <= (c1 - c2) / (m2 - m1) if (x * (m2 - m1) <= c1 - c2) { hi = mid; } else { lo = mid + 1; } } return lines[lo].first * x + lines[lo].second; }; vector<long long> dp(sz); long long ans = LLONG_MAX; for (int j = 1; j <= k; j++) { lines.clear(); add_line(2 * r[sz - j], (long long)-r[sz - j] * r[sz - j] - (j == 1 ? 0 : dp[sz - j + 1])); for (int i = sz - j; i >= 0; i--) { dp[i] = (long long)l[i] * l[i] - query(l[i]); if (i > 0) { add_line(2 * r[i - 1], (long long)-r[i - 1] * r[i - 1] + dp[i]); } } ans = min(ans, dp[0]); } return ans; }
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...