oj.uz

답안 #231642

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
231642 2020-05-14T09:26:20 Z kimbj0709 Building Bridges (CEOI17_building) C++14
60 / 100
 63 ms 9892 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define maxn 100050
struct Line {
  int m, b;
  int operator()(int x) { return m * x + b; }
} a[maxn*4];
void insert(int l, int r, Line seg, int o) {
  if(l + 1 == r) {
    if(seg(l) > a[o](l)) a[o] = seg;
    return;
  }
  int mid= (l + r) >> 1, lson = o * 2 + 1, rson = o * 2 + 2;
  if(a[o].m > seg.m) swap(a[o], seg);
  if(a[o](mid) < seg(mid)) {
    swap(a[o], seg);
    insert(l, mid, seg, lson);
  }
  else insert(mid, r, seg, rson);
}
int query(int l, int r, int x, int o) {
  if(l + 1 == r) return a[o](x);
  int mid = (l + r) >> 1, lson = o * 2 + 1, rson = o * 2 + 2;
  if(x < mid) return max(a[o](x), query(l, mid, x, lson));
  else return max(a[o](x), query(mid, r, x, rson));
}
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  for(int i=0;i<maxn*4;i++){
    a[i] = {0,-LLONG_MAX};
  }
  int no_of_input;
  cin >> no_of_input;
  int input;
  int s = 0;
  vector<int> vect1;
  vector<int> vect2;
  vector<int> dp(no_of_input+1,0);
  for(int i=0;i<no_of_input;i++){
    cin >> input;
    vect1.push_back(input);
  }
  for(int i=0;i<no_of_input;i++){
    cin >> input;
    s += input;
    vect2.push_back(input);
  }
  s -= vect2[0];
  vect2[0] = 0;
  dp[0] = 0;
  Line temp;
  temp.m = 2*vect1[0];
  temp.b = -(vect1[0]*vect1[0]-vect2[0]);
  insert(0,maxn,temp,0);
  for(int i=1;i<no_of_input;i++){
    //cout << query(0,maxn,vect1[i],0) << endl;
    dp[i] = -query(0,maxn,vect1[i],0)-vect2[i]+vect1[i]*vect1[i];
    Line temp;
    temp.m = 2*vect1[i];
    temp.b = -(vect1[i]*vect1[i]+dp[i]);
    //cout << temp.m << " " << temp.b << endl;
    insert(0,maxn,temp,0);
  }
  /*for(int i=0;i<no_of_input;i++){
    cout << dp[i] << ' ';
  }
  cout << endl;*/
  cout << dp[no_of_input-1]+s;
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 6656 KB Output is correct
2 Correct 8 ms 6656 KB Output is correct
3 Correct 8 ms 6656 KB Output is correct
4 Correct 8 ms 6656 KB Output is correct
5 Correct 8 ms 6656 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 46 ms 9840 KB Output is correct
2 Correct 46 ms 9848 KB Output is correct
3 Correct 43 ms 9848 KB Output is correct
4 Correct 40 ms 9848 KB Output is correct
5 Correct 42 ms 9848 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 6656 KB Output is correct
2 Correct 8 ms 6656 KB Output is correct
3 Correct 8 ms 6656 KB Output is correct
4 Correct 8 ms 6656 KB Output is correct
5 Correct 8 ms 6656 KB Output is correct
6 Correct 46 ms 9840 KB Output is correct
7 Correct 46 ms 9848 KB Output is correct
8 Correct 43 ms 9848 KB Output is correct
9 Correct 40 ms 9848 KB Output is correct
10 Correct 42 ms 9848 KB Output is correct
11 Correct 63 ms 9840 KB Output is correct
12 Correct 62 ms 9848 KB Output is correct
13 Correct 51 ms 9848 KB Output is correct
14 Correct 58 ms 9892 KB Output is correct
15 Incorrect 41 ms 9840 KB Output isn't correct
16 Halted 0 ms 0 KB -