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Submission #967066

# Submission time Handle Problem Language Result Execution time Memory
967066 2024-04-21T05:32:02 Z blackslex Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 34 ms 5576 KB 
#include<bits/stdc++.h>

using namespace std;
using ll = long long;

const int M = 1e9 + 7, INV = 5e8 + 4;
int n;

int main() {
    scanf("%d", &n);
    vector<int> h(n + 5), w(n + 5);
    vector<ll>  pref(n + 5);
    for (int i = 1; i <= n; i++) scanf("%d", &h[i]);
    for (int i = 1; i <= n; i++) scanf("%d", &w[i]), pref[i] = pref[i - 1] + w[i], pref[i] %= M;
    vector<int> l(n + 5), r(n + 5, n + 1), sec(n + 5);
    stack<int> st;
    for (int i = 1; i <= n; i++) {
        while (!st.empty() && h[i] <= h[st.top()]) {
            sec[st.top()] = max(sec[st.top()], h[i]);
            st.pop();
        }
        if (!st.empty()) l[i] = st.top();
        st.emplace(i);
    }
    while (!st.empty()) st.pop();
    for (int i = n; i >= 1; i--) {
        while (!st.empty() && h[i] < h[st.top()]) {
            sec[st.top()] = max(sec[st.top()], h[i]);
            st.pop();
        }
        if (!st.empty()) r[i] = st.top();
        st.emplace(i);
    }
    for (int i = 1; i <= n; i++) l[i]++, r[i]--;
    ll ans = 0;
    for (int i = 1; i <= n; i++) {
        ll cursz = pref[r[i]] - pref[l[i] - 1]; cursz %= M; cursz += M; cursz %= M;
        ll pos = cursz * (cursz + 1) % M * INV % M;
        ans += pos * sec[i] % M * (h[i] - sec[i]) % M; ans %= M;
        ans += pos * (h[i] - sec[i]) % M * (h[i] - sec[i] + 1) % M * INV % M; ans %= M;
    }
    printf("%lld", ans);
}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
fancyfence.cpp:13:39: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     for (int i = 1; i <= n; i++) scanf("%d", &h[i]);
      |                                  ~~~~~^~~~~~~~~~~~~
fancyfence.cpp:14:39: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     for (int i = 1; i <= n; i++) scanf("%d", &w[i]), pref[i] = pref[i - 1] + w[i], pref[i] %= M;
      |                                  ~~~~~^~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 15 ms 2324 KB Output is correct
4 Correct 19 ms 4444 KB Output is correct
5 Correct 19 ms 4424 KB Output is correct
6 Correct 19 ms 4184 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 500 KB Output is correct
2 Correct 2 ms 860 KB Output is correct
3 Correct 11 ms 2904 KB Output is correct
4 Correct 34 ms 5440 KB Output is correct
5 Correct 33 ms 5456 KB Output is correct
6 Correct 0 ms 348 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 4 ms 860 KB Output is correct
4 Correct 11 ms 2784 KB Output is correct
5 Correct 26 ms 5328 KB Output is correct
6 Correct 28 ms 5576 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 2 ms 704 KB Output is correct
9 Correct 12 ms 2756 KB Output is correct
10 Correct 30 ms 5204 KB Output is correct
11 Correct 23 ms 5536 KB Output is correct
12 Correct 0 ms 344 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 600 KB Output is correct
7 Correct 1 ms 600 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 448 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 344 KB Output is correct
14 Correct 1 ms 368 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 436 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 600 KB Output is correct
9 Correct 0 ms 436 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 10 ms 2396 KB Output is correct
12 Correct 19 ms 4440 KB Output is correct
13 Correct 22 ms 4436 KB Output is correct
14 Correct 19 ms 4188 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 2 ms 860 KB Output is correct
17 Correct 11 ms 2908 KB Output is correct
18 Correct 21 ms 5328 KB Output is correct
19 Correct 21 ms 5468 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 3 ms 788 KB Output is correct
22 Correct 12 ms 2916 KB Output is correct
23 Correct 33 ms 5192 KB Output is correct
24 Correct 28 ms 5472 KB Output is correct
25 Correct 0 ms 352 KB Output is correct
26 Correct 1 ms 352 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 352 KB Output is correct
29 Correct 1 ms 352 KB Output is correct
30 Correct 3 ms 872 KB Output is correct
31 Correct 3 ms 864 KB Output is correct
32 Correct 11 ms 2656 KB Output is correct
33 Correct 18 ms 2616 KB Output is correct
34 Correct 22 ms 4700 KB Output is correct
35 Correct 33 ms 4696 KB Output is correct
36 Correct 26 ms 4956 KB Output is correct
37 Correct 34 ms 5064 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 32 ms 4984 KB Output is correct
40 Correct 24 ms 4948 KB Output is correct
41 Correct 21 ms 4952 KB Output is correct
42 Correct 21 ms 5212 KB Output is correct