oj.uz

Submission #576726

# Submission time Handle Problem Language Result Execution time Memory
576726 2022-06-13T11:03:03 Z timreizin Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 33 ms 5844 KB 
#include <iostream>
#include <vector>
#include <array>
#include <algorithm>
#include <iomanip>
#include <cmath>
#include <stack>
#include <numeric>

using namespace std;

using ll = long long;

const ll MOD = 1e9 + 7;

ll asum(ll n)
{
    return ((n * (n + 1)) / 2) % MOD;
}

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    //freopen("/Users/timreizin/Downloads/sample/input1.txt", "r", stdin);
    int n;
    cin >> n;
    vector<ll> h(n), w(n);
    for (ll &i : h) cin >> i;
    for (ll &i : w) cin >> i;
    vector<ll> pref(n + 1);
    partial_sum(w.begin(), w.end(), pref.begin() + 1);
    vector<int> sl(n, -1), sr(n, n);
    stack<int> help;
    for (int i = 0; i < n; ++i)
    {
        while (!help.empty() && h[help.top()] >= h[i]) help.pop();
        if (!help.empty()) sl[i] = help.top();
        help.push(i);
    }
    while (!help.empty()) help.pop();
    for (int i = n - 1; i >= 0; --i)
    {
        while (!help.empty() && h[help.top()] > h[i]) help.pop();
        if (!help.empty()) sr[i] = help.top();
        help.push(i);
    }
    ll res = 0;
    for (int i = 0; i < n; ++i)
    {
        /*if (i + 1 < n)
        {
            ll sum = w[i] * w[i + 1] % MOD - 1;
            if (sum < 0) sum += MOD;
            res = (res + sum * min(h[i], h[i + 1])) % MOD;
        }*/
        res = (res + asum(h[i]) * asum(w[i])) % MOD;
        ll l1 = (pref[i] - pref[sl[i] + 1]) % MOD;
        ll l2 = (pref[sr[i]] - pref[i + 1]) % MOD;
        ll sum = (l1 + 1) * (l2 + 1) % MOD - 1;
        if (sum < 0) sum += MOD;
        res = (res + sum * asum(h[i])) % MOD;
        l1 = (l1 * (w[i] - 1)) % MOD;
        l2 = (l2 * (w[i] - 1)) % MOD;
        res = (res + (l1 + l2) * asum(h[i])) % MOD;
    }
    cout << res;
    return 0;
}
/*
2
2 2
2 2
*/

/*
2
1 2
1 2
*/

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 11 ms 2512 KB Output is correct
4 Correct 19 ms 4948 KB Output is correct
5 Correct 21 ms 4704 KB Output is correct
6 Correct 19 ms 4572 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 3 ms 840 KB Output is correct
3 Correct 12 ms 3020 KB Output is correct
4 Correct 23 ms 5720 KB Output is correct
5 Correct 26 ms 5828 KB Output is correct
6 Correct 1 ms 212 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 844 KB Output is correct
4 Correct 13 ms 3016 KB Output is correct
5 Correct 23 ms 5716 KB Output is correct
6 Correct 26 ms 5836 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 3 ms 844 KB Output is correct
9 Correct 13 ms 2892 KB Output is correct
10 Correct 26 ms 5624 KB Output is correct
11 Correct 24 ms 5720 KB Output is correct
12 Correct 1 ms 212 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 240 KB Output is correct
13 Correct 1 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 212 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 328 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 320 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 11 ms 2600 KB Output is correct
12 Correct 20 ms 4936 KB Output is correct
13 Correct 20 ms 4680 KB Output is correct
14 Correct 19 ms 4584 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 3 ms 840 KB Output is correct
17 Correct 13 ms 3012 KB Output is correct
18 Correct 33 ms 5712 KB Output is correct
19 Correct 30 ms 5844 KB Output is correct
20 Correct 1 ms 328 KB Output is correct
21 Correct 3 ms 852 KB Output is correct
22 Correct 13 ms 3004 KB Output is correct
23 Correct 29 ms 5584 KB Output is correct
24 Correct 25 ms 5744 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 3 ms 724 KB Output is correct
31 Correct 3 ms 712 KB Output is correct
32 Correct 12 ms 2764 KB Output is correct
33 Correct 13 ms 2768 KB Output is correct
34 Correct 23 ms 5192 KB Output is correct
35 Correct 28 ms 5228 KB Output is correct
36 Correct 26 ms 5336 KB Output is correct
37 Correct 28 ms 5376 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 30 ms 5324 KB Output is correct
40 Correct 29 ms 5320 KB Output is correct
41 Correct 25 ms 5328 KB Output is correct
42 Correct 27 ms 5580 KB Output is correct