Submission #1194626

#TimeUsernameProblemLanguageResultExecution timeMemory
1194626LucaLucaMMeetings (IOI18_meetings)C++20
19 / 100
5594 ms5836 KiB
#include "meetings.h" #include <iostream> #include <vector> #include <algorithm> #include <cassert> #define debug(x) #x << " = " << x << '\n'; using ll = long long; const ll INF = 1e18; std::vector<ll> minimum_costs(std::vector<int> a, std::vector<int> L, std::vector<int> R) { int n = (int) a.size(); int q = (int) L.size(); std::vector<ll> answer(q, +INF); std::vector<ll> pref(n); auto solve = [&](auto &self, int l, int r) -> void { if (l > r) { return; } int p = l; for (int i = l + 1; i <= r; i++) { if (a[i] > a[p]) { p = i; } } self(self, l, p - 1); self(self, p + 1, r); // raspund la query uri for (int i = 0; i < q; i++) { if (l <= L[i] && L[i] <= p && p <= R[i] && R[i] <= r) { answer[i] = std::min(answer[i], pref[R[i]] + (ll) a[p] * (p - L[i] + 1)); } } // acum trebuie sa recalculez pref[l..r] // pref[l..p-1] ramane la fel // pref[p] ll c = p == l? 0 : pref[p - 1]; pref[p] = c + a[p]; // pref[p+1..r] for (int i = p + 1; i <= r; i++) { pref[i] += (ll) a[p] * (p - l + 1); } for (int i = p + 1; i <= r; i++) { pref[i] = std::min(pref[i], c + (ll) a[p] * (i - p + 1)); } }; solve(solve, 0, n - 1); std::reverse(a.begin(), a.end()); for (int i = 0; i < q; i++) { L[i] = n - 1 - L[i]; R[i] = n - 1 - R[i]; std::swap(L[i], R[i]); } solve(solve, 0, n - 1); return answer; }
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