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답안 #992717

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
992717 2024-06-05T05:41:22 Z PoPularPlusPlus Building Bridges (CEOI17_building) C++17
100 / 100
 52 ms 69464 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vf first
#define vs second
#define pb(x) push_back(x)
#define mp(x,y) make_pair(x,y)

struct Line {
	ll m = 0 , c = 1e18;
};

ll value(Line a , int x){
	return a.m * x + a.c;
}

struct Lichao {
	vector<Line> v;
	int siz;
	
	void init(int n){
		siz = 1;
		while(siz < n){
			siz *= 2;
		}
		
		v.resize(siz * 2);
	}
	
	void set(Line l, int x , int lx , int rx){
		if(rx - lx == 0){
			if(value(l,lx) < value(v[x],lx)){
				v[x] = l;
			}
			return;
		}
		int m = (lx + rx)/2;
		
		if(v[x].m < l.m)swap(v[x],l);
		
		
		if(value(l,m) < value(v[x] , m)){
			swap(l,v[x]);
			set(l , 2 * x , lx , m);
		}
		else {
			set(l , 2 * x + 1 , m + 1 ,rx);
		}
	}
	
	ll query(int x_val , int x , int lx, int rx){
		ll ans = value(v[x],x_val);
		if(rx == lx)return ans;
		int mid = (lx + rx)/2;
		if(x_val <= mid){
			ans = min(ans , query(x_val , 2 *x, lx,mid));
		}
		else ans = min(ans , query(x_val, 2 * x + 1 , mid + 1 ,rx));
		return ans;
	}
};

void solve(){
	int n;
	cin >> n;
	ll h[n];
	for(int i = 0; i < n; i++){
		cin >> h[i];
	}
	ll w[n];
	for(int i = 0; i < n; i++){
		cin >> w[i];
	}
	
	ll dp[n];
	
	Lichao li;
	li.init(2000005);
	
	dp[0] = -w[0];
	li.set({-2*h[0] , h[0]*h[0] - w[0]},1,0,li.siz-1);
		
	ll ans = 0;
	for(int i = 0; i < n; i++){
		ans += w[i];
	}
	
	for(int i = 1; i < n; i++){
		dp[i] = li.query(h[i],1,0,li.siz-1) + h[i] * h[i] - w[i];
		
		li.set({-2*h[i] , h[i]*h[i] +dp[i]},1,0,li.siz-1);
	}
	
	cout << dp[n-1] + ans << '\n';
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	//int t;
	//cin >> t;
	//	while(t--)
	solve();
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 65884 KB Output is correct
2 Correct 9 ms 65972 KB Output is correct
3 Correct 10 ms 66040 KB Output is correct
4 Correct 10 ms 66140 KB Output is correct
5 Correct 10 ms 66136 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 68436 KB Output is correct
2 Correct 46 ms 68296 KB Output is correct
3 Correct 50 ms 68432 KB Output is correct
4 Correct 38 ms 68444 KB Output is correct
5 Correct 38 ms 68444 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 65884 KB Output is correct
2 Correct 9 ms 65972 KB Output is correct
3 Correct 10 ms 66040 KB Output is correct
4 Correct 10 ms 66140 KB Output is correct
5 Correct 10 ms 66136 KB Output is correct
6 Correct 42 ms 68436 KB Output is correct
7 Correct 46 ms 68296 KB Output is correct
8 Correct 50 ms 68432 KB Output is correct
9 Correct 38 ms 68444 KB Output is correct
10 Correct 38 ms 68444 KB Output is correct
11 Correct 48 ms 69456 KB Output is correct
12 Correct 52 ms 69464 KB Output is correct
13 Correct 41 ms 69456 KB Output is correct
14 Correct 49 ms 69456 KB Output is correct
15 Correct 36 ms 69200 KB Output is correct
16 Correct 36 ms 69212 KB Output is correct
17 Correct 32 ms 69460 KB Output is correct
18 Correct 40 ms 69464 KB Output is correct