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Submission #397141

# Submission time Handle Problem Language Result Execution time Memory
397141 2021-05-01T14:18:11 Z Sohsoh84 Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 92 ms 6584 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define all(x)                      (x).begin(),(x).end()
#define X                           first
#define Y                           second
#define sep                         ' '
#define endl                        '\n'
#define debug(x)                    cerr << #x << ": " <<  x << endl;

const ll MAXN = 1e6 + 10;
const ll INF = 8e18;
const ll MOD = 1e9 + 7; // 998244353; // 1e9 + 9;
const ll INV2 = 500000004;

ll L[MAXN], H[MAXN], W[MAXN];
set<pll> st;

inline void mkey(ll& a) {
	if (a >= MOD) a -= MOD;
	if (a < 0) a += MOD;
}

inline ll C2(ll a) {
	a %= MOD;
	return a * (a - 1) % MOD * INV2 % MOD;;
} 

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int n;
	cin >> n;
	vector<int> v;
	for (int i = 1; i <= n; i++) {
		cin >> H[i];
		v.push_back(i);
	}

	L[0] = 1;
	ll tot = 0;
	for (int i = 1; i <= n; i++) {
		cin >> W[i];
		L[i] = L[i - 1] + W[i - 1];
		tot += W[i];
	}

	ll T = C2(tot + 1);
	st.insert({1, tot});

	sort(all(v), [] (int i, int j) {
		return H[i] < H[j];		
	});


	ll lst = 0, ans = 0;
	for (int e : v) {
		mkey(ans += T * (C2(H[e] + 1) - C2(lst + 1) + MOD) % MOD);
		ll l = L[e], r = l + W[e] - 1;
		auto it = st.upper_bound(make_pair(l, INF));
		it--;
		ll tl = it -> X, tr = it -> Y;
		mkey(T -= C2(tr - tl + 2));
		ll m_r = l - 1, m_l = r + 1;
		st.erase(it);

		if (m_r >= tl) {
			mkey(T += C2(m_r - tl + 2));
			st.insert({tl, m_r});
		} 

		if (m_l <= tr) {
			mkey(T += C2(tr - m_l + 2));
		       	st.insert({m_l, tr});	
		}

		lst = H[e];
	}

	cout << ans << endl;
	return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 29 ms 3076 KB Output is correct
4 Correct 44 ms 5188 KB Output is correct
5 Correct 48 ms 5680 KB Output is correct
6 Correct 40 ms 4760 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 4 ms 592 KB Output is correct
3 Correct 18 ms 1792 KB Output is correct
4 Correct 36 ms 3120 KB Output is correct
5 Correct 38 ms 3140 KB Output is correct
6 Correct 1 ms 332 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 4 ms 592 KB Output is correct
4 Correct 18 ms 1744 KB Output is correct
5 Correct 36 ms 3212 KB Output is correct
6 Correct 38 ms 3136 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 4 ms 588 KB Output is correct
9 Correct 19 ms 1772 KB Output is correct
10 Correct 35 ms 3184 KB Output is correct
11 Correct 36 ms 5096 KB Output is correct
12 Correct 1 ms 324 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 2 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 328 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 24 ms 3024 KB Output is correct
12 Correct 53 ms 5188 KB Output is correct
13 Correct 47 ms 5692 KB Output is correct
14 Correct 40 ms 4812 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 4 ms 844 KB Output is correct
17 Correct 18 ms 2768 KB Output is correct
18 Correct 38 ms 5168 KB Output is correct
19 Correct 43 ms 5192 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 4 ms 844 KB Output is correct
22 Correct 19 ms 2768 KB Output is correct
23 Correct 36 ms 5024 KB Output is correct
24 Correct 36 ms 5060 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 460 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 7 ms 972 KB Output is correct
31 Correct 7 ms 888 KB Output is correct
32 Correct 36 ms 3340 KB Output is correct
33 Correct 50 ms 3372 KB Output is correct
34 Correct 80 ms 6396 KB Output is correct
35 Correct 73 ms 6388 KB Output is correct
36 Correct 92 ms 6472 KB Output is correct
37 Correct 84 ms 6584 KB Output is correct
38 Correct 1 ms 332 KB Output is correct
39 Correct 72 ms 5256 KB Output is correct
40 Correct 53 ms 5060 KB Output is correct
41 Correct 45 ms 5140 KB Output is correct
42 Correct 36 ms 5152 KB Output is correct