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Submission #534862

# Submission time Handle Problem Language Result Execution time Memory
534862 2022-03-09T04:38:35 Z leinad2 Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 46 ms 15696 KB 
#include<bits/stdc++.h>
#define int long long
using namespace std;
int A[100010], B[100010], n, i, j, k, a, b, C[100010], mod=1e9+7;
int ans;
int f(int a)
{
    return ((a*(a+1))/2)%mod;
}
int g(int a)
{
    return ((f(a)*(2*a+1))%mod*333333336)%mod;
}
int get(int a, int b, int c)
{
    a%=mod;b%=mod;c%=mod;
    int ans=0;
    ans+=g(a)*c;
    ans+=g(c)*a;
    ans+=f(a)*c;
    ans+=f(c)*a;
    ans+=((f(a)*f(b))%mod*(2*b+2))%mod;
    ans+=(((b+b*b)%mod*a)%mod*b)%mod;
    ans%=mod;
    if(ans%2)ans+=mod;
    ans/=2;
    return ans;
}
struct seg
{
    pair<int, int>seg[400010];
    void init(int id, int s, int e)
    {
        if(s==e)
        {
            seg[id]={B[s], s};
            return;
        }
        int m=s+e>>1;
        init(id*2, s, m);init(id*2+1, m+1, e);
        seg[id]=min(seg[id*2], seg[id*2+1]);
    }
    pair<int, int>get(int id, int s, int e, int l, int r)
    {
        if(e<l||r<s)return {1e9, 1e9};
        if(l<=s&&e<=r)return seg[id];
        int m=s+e>>1;
        return min(get(id*2, s, m, l, r), get(id*2+1, m+1, e, l, r));
    }
}seg;
void dnc(int l, int r)
{
    if(l>r)return;
    pair<int, int>p=seg.get(1, 1, n, l, r);
    int x=p.second;
    int res=0;
    int a=C[x-1]-C[l-1], b=A[x], c=C[r]-C[x];
    a%=mod;b%=mod;c%=mod;
    res+=f(b);
    res+=a*c;
    res+=b*c;
    res+=a*b;
    res%=mod;
    res*=f(p.first);
    res%=mod;
    ans+=res;
    ans%=mod;
    dnc(l, x-1);dnc(x+1, r);
}
main()
{
    ios_base::sync_with_stdio(!cin.tie(NULL));
    for(cin>>n;i++<n;)cin>>B[i];
    for(i=0;i++<n;)
    {
        cin>>A[i];
        C[i]=C[i-1]+A[i];
    }
    seg.init(1, 1, n);
    dnc(1, n);
    cout<<ans;
}

Compilation message

fancyfence.cpp: In member function 'void seg::init(long long int, long long int, long long int)':
fancyfence.cpp:39:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   39 |         int m=s+e>>1;
      |               ~^~
fancyfence.cpp: In member function 'std::pair<long long int, long long int> seg::get(long long int, long long int, long long int, long long int, long long int)':
fancyfence.cpp:47:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |         int m=s+e>>1;
      |               ~^~
fancyfence.cpp: At global scope:
fancyfence.cpp:70:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   70 | main()
      | ^~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 17 ms 4168 KB Output is correct
4 Correct 32 ms 7912 KB Output is correct
5 Correct 33 ms 7864 KB Output is correct
6 Correct 34 ms 7928 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 4 ms 1232 KB Output is correct
3 Correct 21 ms 4608 KB Output is correct
4 Correct 36 ms 8648 KB Output is correct
5 Correct 38 ms 8704 KB Output is correct
6 Correct 1 ms 332 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 4 ms 1268 KB Output is correct
4 Correct 22 ms 4460 KB Output is correct
5 Correct 41 ms 8644 KB Output is correct
6 Correct 38 ms 8760 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 4 ms 1220 KB Output is correct
9 Correct 19 ms 4480 KB Output is correct
10 Correct 35 ms 8588 KB Output is correct
11 Correct 37 ms 8576 KB Output is correct
12 Correct 0 ms 332 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 324 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 320 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 328 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 1 ms 324 KB Output is correct
11 Correct 17 ms 4040 KB Output is correct
12 Correct 32 ms 7844 KB Output is correct
13 Correct 35 ms 7876 KB Output is correct
14 Correct 34 ms 7868 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 4 ms 1256 KB Output is correct
17 Correct 18 ms 4424 KB Output is correct
18 Correct 46 ms 8772 KB Output is correct
19 Correct 43 ms 8808 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 13 ms 1228 KB Output is correct
22 Correct 19 ms 4556 KB Output is correct
23 Correct 34 ms 8524 KB Output is correct
24 Correct 35 ms 8644 KB Output is correct
25 Correct 1 ms 328 KB Output is correct
26 Correct 1 ms 328 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 5 ms 1248 KB Output is correct
31 Correct 6 ms 1220 KB Output is correct
32 Correct 22 ms 4424 KB Output is correct
33 Correct 20 ms 4488 KB Output is correct
34 Correct 39 ms 8388 KB Output is correct
35 Correct 39 ms 8472 KB Output is correct
36 Correct 41 ms 8672 KB Output is correct
37 Correct 41 ms 8584 KB Output is correct
38 Correct 1 ms 332 KB Output is correct
39 Correct 41 ms 8676 KB Output is correct
40 Correct 42 ms 8772 KB Output is correct
41 Correct 44 ms 10036 KB Output is correct
42 Correct 43 ms 15696 KB Output is correct