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답안 #49305

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
49305 2018-05-25T11:36:23 Z tmwilliamlin168 Building Bridges (CEOI17_building) C++14
0 / 100
 53 ms 35956 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll, ll>
#define fi first
#define se second

const int mxN=1e5, mxH=8, sts=1<<21;
int n;
ll h[mxN], pw[mxN+1];
pll st[sts];

void upd(pll nl, int i=1, int l=0, int r=mxH) {
//	if(i==1)
//		cout << nl.fi << " " << nl.se << endl;
	int m=(l+r)/2;
	if(nl.fi*m+nl.se<st[i].fi*m+st[i].se)
		swap(nl, st[i]);
	if(l==r)
		return;
	if(nl.fi*l+nl.se<st[i].fi*l+st[i].se)
		upd(nl, 2*i, l, m);
	else
		upd(nl, 2*i+1, m+1, r);
}

ll qry(int x, int i=1, int l=0, int r=mxH) {
	int m=(l+r)/2;
	ll s=st[i].fi*x+st[i].se;
	if(l<r) {
		if(x<=m)
			s=min(qry(x, 2*i, l, m), s);
		else
			s=min(qry(x, 2*i+1, m+1, r), s);
	}
//	cout << x << " " << s << " " << l << " " << r << endl;
	return s;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n;
	for(int i=0; i<n; ++i)
		cin >> h[i];
	for(int i=0; i<n; ++i)
		cin >> pw[i+1], pw[i+1]+=pw[i];
	for(int i=1; i<sts; ++i)
		st[i]={-2*h[0], h[0]*h[0]-pw[1]};
	for(int i=1; i<n; ++i) {
		ll dp=h[i]*h[i]+pw[i]+qry(h[i]);
//		cout << qry(h[i]) << " ";
		upd({-2*h[i], dp-pw[i+1]+h[i]*h[i]});
		if(i==n-1)
			cout << dp;
//		cout << endl;
	}
}

Subtask #1
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 33144 KB Output is correct
2 Incorrect 28 ms 33256 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 53 ms 35956 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 33144 KB Output is correct
2 Incorrect 28 ms 33256 KB Output isn't correct
3 Halted 0 ms 0 KB -