Submission #348277

#TimeUsernameProblemLanguageResultExecution timeMemory
348277MrDominoSafety (NOI18_safety)C++14
71 / 100
476 ms62988 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; #define int ll multiset<int> form(multiset<int> s1, multiset<int> s2, int add1, int add2) { multiset<int> s; for (auto &x : s1) { s.insert(x + add1); } for (auto &x : s2) { s.insert(x + add2); } return s; } void print(multiset<int> s) { cout << " : "; for (auto &x : s) { cout << x << " "; } cout << "\n"; } int get(multiset<int> s, int a, int b) { int n = (int) s.size(); vector<int> xs; for (auto &it : s) { xs.push_back(it); } for (int i = n - 1; i >= 0; i--) { b += xs[i]; a--; if (a == 0) { return b; } } assert(0); } signed main() { ios::sync_with_stdio(0); cin.tie(0); multiset<int> s1, s2; int n, h, x, b = 0, add1 = 0, add2 = 0; cin >> n >> h >> x; s1.insert(x); s2.insert(x); b = -x; b -= h * (n - 1) * n / 2; for (int i = 2; i <= n; i++) { add1 -= h; add2 += h; int cut = *s2.begin() + add2; int x; cin >> x; b -= x; if (x < cut) { s1.insert(x - add1); s1.insert(x - add1); auto it = s1.end(); it--; int val = *it + add1; s1.erase(it); s2.insert(val - add2); } else { s2.insert(x - add2); s2.insert(x - add2); auto it = s2.begin(); int val = *it + add2; s2.erase(it); s1.insert(val - add1); } } multiset<int> s = form(s1, s2, add1, add2); cout << get(s, (int) s.size() / 2, b) << "\n"; }
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