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Submission #782515

# Submission time Handle Problem Language Result Execution time Memory
782515 2023-07-14T03:51:33 Z t6twotwo Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 27 ms 4184 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr int mod = 1e9 + 7;
constexpr int i2 = 500000004;
constexpr int i6 = 166666668;
int mul(int a, int b) {
    return 1LL * a * b % mod;
}
void add(int &a, int b) {
    a += b;
    if (a >= mod) {
        a -= mod;
    }
}
void sub(int &a, int b) {
    a -= b;
    if (a < 0) {
        a += mod;
    }
}
int f(int n) {
    return mul(i2, mul(n, n + 1)); 
} 
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    cin >> N;
    vector<int> h(N), w(N); 
    for (int &x : h) {
        cin >> x;
    }
    for (int &x : w) {
        cin >> x;
    }
    int ans = 0, s = 0;
    vector<array<int, 2>> stk;
    for (int i = 0; i < N; i++) {
        add(ans, mul(f(h[i]), f(w[i])));
        int t = w[i];
        while (!stk.empty() && stk.back()[0] >= h[i]) {
            sub(s, mul(f(stk.back()[0]), stk.back()[1]));
            add(t, stk.back()[1]);
            stk.pop_back();
        }
        add(s, mul(f(h[i]), t));
        add(ans, mul(w[i], s));
        sub(ans, mul(f(h[i]), mul(w[i], w[i])));
        stk.push_back({h[i], t});
    }
    cout << ans << "\n";
    return 6/22;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 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 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 8 ms 1216 KB Output is correct
4 Correct 18 ms 2252 KB Output is correct
5 Correct 15 ms 2280 KB Output is correct
6 Correct 15 ms 2260 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 468 KB Output is correct
3 Correct 10 ms 1608 KB Output is correct
4 Correct 22 ms 3012 KB Output is correct
5 Correct 22 ms 3144 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 2 ms 596 KB Output is correct
4 Correct 11 ms 1728 KB Output is correct
5 Correct 18 ms 3028 KB Output is correct
6 Correct 20 ms 3144 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 732 KB Output is correct
9 Correct 9 ms 2112 KB Output is correct
10 Correct 18 ms 4024 KB Output is correct
11 Correct 18 ms 4184 KB Output is correct
12 Correct 0 ms 320 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 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 0 ms 316 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 352 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 328 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 0 ms 320 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 324 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 316 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 8 ms 1232 KB Output is correct
12 Correct 17 ms 2252 KB Output is correct
13 Correct 15 ms 2252 KB Output is correct
14 Correct 18 ms 2248 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 2 ms 508 KB Output is correct
17 Correct 9 ms 1608 KB Output is correct
18 Correct 18 ms 3024 KB Output is correct
19 Correct 18 ms 3144 KB Output is correct
20 Correct 1 ms 324 KB Output is correct
21 Correct 3 ms 792 KB Output is correct
22 Correct 14 ms 1996 KB Output is correct
23 Correct 18 ms 4040 KB Output is correct
24 Correct 18 ms 4180 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 1 ms 328 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 3 ms 596 KB Output is correct
31 Correct 4 ms 584 KB Output is correct
32 Correct 11 ms 1476 KB Output is correct
33 Correct 9 ms 1608 KB Output is correct
34 Correct 18 ms 2760 KB Output is correct
35 Correct 27 ms 2772 KB Output is correct
36 Correct 19 ms 3020 KB Output is correct
37 Correct 19 ms 3024 KB Output is correct
38 Correct 1 ms 212 KB Output is correct
39 Correct 24 ms 3016 KB Output is correct
40 Correct 24 ms 3004 KB Output is correct
41 Correct 19 ms 3148 KB Output is correct
42 Correct 21 ms 3680 KB Output is correct