제출 #582910

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
582910		600Mihnea	Building Bridges (CEOI17_building)	C++17	30 / 100	3060 ms	8184 KiB

building

#include <bits/stdc++.h>

using namespace std;

typedef long double ld;
typedef long long ll;

const ll INF = (ll) 1e18 + 7;

struct T {
  ll a;
  ll b;
  bool mt = 1;

  ll evaluate(ll x) {
    if (mt) {
      return INF;
    }
    return a * x + b;
  }
};

const int N = (int) 1e5 + 7;
int n;
ll h[N];
ll sum[N];
ll dp[N];
T coef[N];

signed main() {
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

  cin >> n;
  for (int i = 1; i <= n; i++) {
    int x;
    cin >> x;
    h[i] = x;
  }
  for (int i = 1; i <= n; i++) {
    int x;
    cin >> x;
    sum[i] = sum[i - 1] + x;
  }

  dp[1] = 0;
  for (int i = 2; i <= n; i++) {
    dp[i] = INF;
  }

  vector<T> all;

  for (int r = 2; r <= n; r++) {
    T line = {- 2 * h[r - 1], dp[r - 1] + h[r - 1] * h[r - 1] - sum[r - 1]};
    line.mt = 0;

    all.push_back(line);



    ll x = h[r];
    for (auto &ln : all) {
      dp[r] = min(dp[r], ln.a * x + ln.b);
    }
    dp[r] += h[r] * h[r] + sum[r - 1];
  }

  cout << dp[n] << "\n";

}

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40