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Submission #881460

# Submission time Handle Problem Language Result Execution time Memory
881460 2023-12-01T09:09:19 Z Danet Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 68 ms 6180 KB 
#include<bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O3")

#define tof_io  ios_base::sync_with_stdio(false);cin.tie(0) , cout.tie(0);
#define double  long double
#define int     long long
#define pb      push_back
#define all(x)  x.begin(),x.end()
#define endl    '\n'

const int mod = 1e9+7; //998244353
const long long inf = 1e18;
const int N = 1e3 + 23;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
int modplus(int x) {if (x >= mod) {x -= mod;} else if (x < 0) {x += mod;}return x;} 
int nc2(int x){x = x * (x+1);return x;}
vector<pair<int, int>> s;
vector<int> h;
vector<int> ps;
vector<int> ks;
int ans = 0;
int res = 0;
void sl(int i){while (s.back().first >= h[i]) {int tmp = (s.back().second - s[s.size() - 2ll].second) % mod;res = modplus(res - tmp * (nc2(s.back().first) / 2 % mod) % mod);s.pop_back();}}
void cal(int i)
{
int tmp = ks[i] % mod;
ans = modplus(ans + res % mod * tmp % mod);
ans = modplus(ans + (nc2(tmp) % nc2(mod)/2 % mod) * (nc2(h[i]) % nc2(mod)/2 % mod) % mod);
res = modplus(res + (nc2(h[i]) / 2 % mod) * tmp % mod);
s.pb(make_pair(h[i], ps[i]));
}
void cand(int i)
{
    if (s.back().second != ps[i-1]) 
    {
        int tmp = (ps[i - 1] - s.back().second) % mod;
        res = modplus(res + tmp * (nc2(h[i]) / 2 % mod) % mod);
        s.pb(make_pair(h[i], ps[i - 1]));
    }
}
int32_t main() 
{
    int n;
    cin >> n;

    h.pb(0);
    ps.pb(0);
    ks.pb(0);
    for (int i = 0; i < n; i++) 
    {
        int x;
        cin >> x;
        h.pb(x);
    }
    for (int i = 0; i < n; i++) 
    {
        int x;
        cin >> x;
        ks.pb(x);
        ps.pb(x + ps[i]);
    }
    s.pb(make_pair(0ll,0ll));
    for (int i = 0; i < n; i++) 
    {
        sl(i + 1);
        cand(i + 1);
        cal(i + 1);
    }
    cout << ans;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 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 26 ms 2700 KB Output is correct
4 Correct 44 ms 4176 KB Output is correct
5 Correct 46 ms 4216 KB Output is correct
6 Correct 48 ms 4340 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 6 ms 996 KB Output is correct
3 Correct 30 ms 2624 KB Output is correct
4 Correct 59 ms 4804 KB Output is correct
5 Correct 63 ms 4808 KB Output is correct
6 Correct 1 ms 348 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 444 KB Output is correct
3 Correct 6 ms 860 KB Output is correct
4 Correct 30 ms 2772 KB Output is correct
5 Correct 61 ms 4552 KB Output is correct
6 Correct 66 ms 5040 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 8 ms 1112 KB Output is correct
9 Correct 39 ms 3052 KB Output is correct
10 Correct 58 ms 6112 KB Output is correct
11 Correct 58 ms 6180 KB Output is correct
12 Correct 0 ms 348 KB Output is correct

Subtask #6
18.0 / 18.0

# 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 500 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 440 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 2 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 2 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 344 KB Output is correct
2 Correct 1 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
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 22 ms 2564 KB Output is correct
12 Correct 51 ms 4296 KB Output is correct
13 Correct 44 ms 4292 KB Output is correct
14 Correct 43 ms 4292 KB Output is correct
15 Correct 1 ms 344 KB Output is correct
16 Correct 6 ms 860 KB Output is correct
17 Correct 30 ms 2772 KB Output is correct
18 Correct 60 ms 4808 KB Output is correct
19 Correct 62 ms 4832 KB Output is correct
20 Correct 2 ms 348 KB Output is correct
21 Correct 6 ms 1276 KB Output is correct
22 Correct 31 ms 3020 KB Output is correct
23 Correct 57 ms 6000 KB Output is correct
24 Correct 68 ms 5996 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 7 ms 960 KB Output is correct
31 Correct 6 ms 860 KB Output is correct
32 Correct 28 ms 2764 KB Output is correct
33 Correct 30 ms 2772 KB Output is correct
34 Correct 58 ms 4296 KB Output is correct
35 Correct 57 ms 4628 KB Output is correct
36 Correct 67 ms 4660 KB Output is correct
37 Correct 61 ms 4860 KB Output is correct
38 Correct 0 ms 344 KB Output is correct
39 Correct 60 ms 4752 KB Output is correct
40 Correct 60 ms 4676 KB Output is correct
41 Correct 58 ms 4692 KB Output is correct
42 Correct 62 ms 5364 KB Output is correct