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Submission #567614

# Submission time Handle Problem Language Result Execution time Memory
567614 2022-05-23T20:01:56 Z stevancv Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 34 ms 5100 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
using namespace std;
const int N = 2e5 + 5;
const ll mod = 1e9 + 7;
ll Add(ll a, ll b) {
    a += b;
    if (a >= mod) a -= mod;
    return a;
}
ll Sub(ll a, ll b) {
    a -= b;
    if (a < 0) a += mod;
    return a;
}
ll Md(ll x) {
    while (x < 0) x += mod;
    while (x >= mod) x -= mod;
    return x;
}
ll Mul(ll a, ll b) {
    return (a * b) % mod;
}
ll Exp(ll x, ll k) {
    ll ans = 1;
    for (; k; k >>= 1) {
        x = Mul(x, x);
        if (k & 1) ans = Mul(ans, x);
    }
    return ans;
}
ll Div(ll a, ll b) {
    return Mul(a, Exp(b, mod - 2));
}
ll G(ll x) {
    ll y = x * (x + 1) / 2;
    y %= mod;
    return y;
}
ll F(ll H, ll W) {
    H = G(H);
    W = G(W);
    H %= mod;
    W %= mod;
    return Mul(H, W);
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    vector<ll> h(n), w(n), p(n);
    for (int i = 0; i < n; i++) {
        cin >> h[i];
    }
    for (int i = 0; i < n; i++) {
        cin >> w[i];
        p[i] = w[i];
        if (i > 0) p[i] = Add(p[i], p[i - 1]);
    }
    ll ans = 0;
    stack<int> s;
    for (int i = 0; i < n; i++) {
        while (!s.empty() && h[s.top()] > h[i]) {
            int j = s.top();
            s.pop();
            int k = -1;
            if (!s.empty()) k = s.top();
            ll mx = h[i];
            if (k != -1) mx = max(mx, h[k]);
            ll H = h[j] - mx;
            ll W = p[i - 1];
            if (k != -1) W = Sub(W, p[k]);
            ans = Add(ans, F(H, W));
            ans = Add(ans, Mul(G(W), Mul(H, mx)));
        }
        s.push(i);
    }
    while (!s.empty()) {
        int j = s.top();
        s.pop();
        int k = -1;
        if (!s.empty()) k = s.top();
        ll mx = 0;
        if (k != -1) mx = max(mx, h[k]);
        ll H = h[j] - mx;
        ll W = p[n - 1];
        if (k != -1) W = Sub(W, p[k]);
        ans = Add(ans, F(H, W));
        ans = Add(ans, Mul(G(W), Mul(H, mx)));
    }
    cout << ans << en;
    return 0;

}

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 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 316 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 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 12 ms 2136 KB Output is correct
4 Correct 19 ms 4076 KB Output is correct
5 Correct 19 ms 3956 KB Output is correct
6 Correct 18 ms 3804 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 748 KB Output is correct
3 Correct 12 ms 2636 KB Output is correct
4 Correct 23 ms 4956 KB Output is correct
5 Correct 27 ms 5068 KB Output is correct
6 Correct 0 ms 212 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 320 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 4 ms 712 KB Output is correct
4 Correct 13 ms 2592 KB Output is correct
5 Correct 25 ms 4968 KB Output is correct
6 Correct 34 ms 5100 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 3 ms 724 KB Output is correct
9 Correct 14 ms 2644 KB Output is correct
10 Correct 26 ms 4956 KB Output is correct
11 Correct 23 ms 4984 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 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 324 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 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 0 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 332 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 324 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 9 ms 2132 KB Output is correct
12 Correct 22 ms 4072 KB Output is correct
13 Correct 18 ms 3932 KB Output is correct
14 Correct 19 ms 3828 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 4 ms 724 KB Output is correct
17 Correct 13 ms 2640 KB Output is correct
18 Correct 24 ms 4972 KB Output is correct
19 Correct 25 ms 5088 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 3 ms 748 KB Output is correct
22 Correct 12 ms 2640 KB Output is correct
23 Correct 22 ms 4808 KB Output is correct
24 Correct 31 ms 4948 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 328 KB Output is correct
30 Correct 3 ms 716 KB Output is correct
31 Correct 3 ms 724 KB Output is correct
32 Correct 12 ms 2260 KB Output is correct
33 Correct 13 ms 2388 KB Output is correct
34 Correct 22 ms 4300 KB Output is correct
35 Correct 22 ms 4328 KB Output is correct
36 Correct 23 ms 4592 KB Output is correct
37 Correct 29 ms 4584 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 24 ms 4592 KB Output is correct
40 Correct 25 ms 4820 KB Output is correct
41 Correct 23 ms 4584 KB Output is correct
42 Correct 24 ms 4708 KB Output is correct