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Submission #1116437

# Submission time Handle Problem Language Result Execution time Memory
1116437 2024-11-21T16:14:51 Z jamesbamber Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 59 ms 3896 KB 
#include <vector>
#include <stack>
#include <cassert>
#include <iostream>
using namespace std;

constexpr int MOD = 1e9+7;

int main(){
  	int N; cin >> N;
    vector<int> L(N), W(N);
  	for(int &x: L) cin >> x;
  	for(int &x: W) cin >> x;
    
    L.resize(N+2); 
    W.resize(N+2);
    for(int i=N; i>0; i--) L[i] = L[i-1]; L[0] = 0;
    for(int i=N; i>0; i--) W[i] = W[i-1]; W[0] = 0;
    N+=2; 
    
    vector<int> pf(N+1);
    for(int i=0; i<N; i++) pf[i+1] = (pf[i] + W[i])%MOD;

    auto count_rect = [&](long long l_high, long long l_low, long long w){
        long long l = l_high - l_low;
        return ((w*(w+1)/2)%MOD) * ((l*(l+1)/2)%MOD + l*l_low%MOD)%MOD;
    };

    long long ans = 0;
    stack<int> st;
    for(int i=0; i<N; i++){
        while(st.size() and L[st.top()] >= L[i]){
            int j = st.top(); st.pop();

            if(j == 0) break;

            int l2 = L[j];
            int l1 = max(L[i], L[st.top()]);

            int w = (pf[i] - pf[st.top()+1] + MOD)%MOD;
            ans += count_rect(l2, l1, w);
            ans %= MOD;
        }
        st.push(i);
    }
    assert(st.size() == 1);
    cout << ans;
}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:17:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   17 |     for(int i=N; i>0; i--) L[i] = L[i-1]; L[0] = 0;
      |     ^~~
fancyfence.cpp:17:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   17 |     for(int i=N; i>0; i--) L[i] = L[i-1]; L[0] = 0;
      |                                           ^
fancyfence.cpp:18:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   18 |     for(int i=N; i>0; i--) W[i] = W[i-1]; W[0] = 0;
      |     ^~~
fancyfence.cpp:18:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   18 |     for(int i=N; i>0; i--) W[i] = W[i-1]; W[0] = 0;
      |                                           ^

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 440 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 504 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 19 ms 1480 KB Output is correct
4 Correct 35 ms 2752 KB Output is correct
5 Correct 36 ms 2752 KB Output is correct
6 Correct 36 ms 2760 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 6 ms 592 KB Output is correct
3 Correct 26 ms 1916 KB Output is correct
4 Correct 51 ms 3548 KB Output is correct
5 Correct 53 ms 3640 KB Output is correct
6 Correct 1 ms 336 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 2 ms 484 KB Output is correct
3 Correct 6 ms 592 KB Output is correct
4 Correct 26 ms 1980 KB Output is correct
5 Correct 52 ms 3540 KB Output is correct
6 Correct 57 ms 3628 KB Output is correct
7 Correct 2 ms 336 KB Output is correct
8 Correct 6 ms 592 KB Output is correct
9 Correct 27 ms 2076 KB Output is correct
10 Correct 52 ms 3640 KB Output is correct
11 Correct 55 ms 3896 KB Output is correct
12 Correct 1 ms 336 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 2 ms 508 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 508 KB Output is correct
5 Correct 1 ms 516 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 2 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 452 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 2 ms 448 KB Output is correct
16 Correct 1 ms 572 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 2 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 592 KB Output is correct
11 Correct 20 ms 1480 KB Output is correct
12 Correct 37 ms 2752 KB Output is correct
13 Correct 36 ms 2772 KB Output is correct
14 Correct 35 ms 2760 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 7 ms 592 KB Output is correct
17 Correct 27 ms 2004 KB Output is correct
18 Correct 55 ms 3496 KB Output is correct
19 Correct 57 ms 3640 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 6 ms 712 KB Output is correct
22 Correct 28 ms 1944 KB Output is correct
23 Correct 52 ms 3636 KB Output is correct
24 Correct 54 ms 3744 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 2 ms 336 KB Output is correct
29 Correct 2 ms 336 KB Output is correct
30 Correct 6 ms 708 KB Output is correct
31 Correct 7 ms 592 KB Output is correct
32 Correct 29 ms 1948 KB Output is correct
33 Correct 27 ms 1992 KB Output is correct
34 Correct 51 ms 3364 KB Output is correct
35 Correct 51 ms 3240 KB Output is correct
36 Correct 59 ms 3520 KB Output is correct
37 Correct 53 ms 3504 KB Output is correct
38 Correct 1 ms 336 KB Output is correct
39 Correct 57 ms 3520 KB Output is correct
40 Correct 58 ms 3540 KB Output is correct
41 Correct 51 ms 3520 KB Output is correct
42 Correct 54 ms 3640 KB Output is correct