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Submission #1059123

# Submission time Handle Problem Language Result Execution time Memory
1059123 2024-08-14T17:32:23 Z DucNguyen2007 Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 26 ms 5980 KB 
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pii pair<int,int>
#define pll pair<ll,ll>
#define fi first
#define se second
const int maxN=1e5+5,MOD=1e9+7,REVMOD=250000002;
const ll inf=2e18;
int n,l[maxN+1],r[maxN+1];
ll h[maxN+1],w[maxN+1],s[maxN+1];
stack<int> st;
void clr()
{
    while(!st.empty())
    {
        st.pop();
    }
}
ll mul(ll x,ll y)
{
    return (x*y)%MOD;
}
ll sc(ll x1,ll x2)
{
    ll tmp=mul(x1+1,x2+1);
    tmp--;
    if(tmp<0)
    {
        tmp+=MOD;
    }
    return tmp;
}
ll calc(ll n,ll m)
{
    return mul(mul(mul(1LL*n,1LL*(n+1)),mul(1LL*m,1LL*(m+1))),REVMOD);
}
ll get(ll x1,ll x2,int i)
{
    return mul((mul(w[i]-1,x1+x2)+sc(x1,x2))%MOD,calc(1,h[i]));
}
int main()
{
    //freopen("","r",stdin);
    //freopen("","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>h[i];
    }
    s[0]=0;
    for(int i=1;i<=n;i++)
    {
        cin>>w[i];
        s[i]=(s[i-1]+w[i])%MOD;
    }
    clr();
    for(int i=1;i<=n;i++)
    {
        while(!st.empty()&&h[st.top()]>=h[i])
        {
            st.pop();
        }
        if(st.empty())
        {
            l[i]=1;
        }
        else l[i]=st.top()+1;
        st.push(i);
    }
    clr();
    for(int i=n;i>=1;i--)
    {
        while(!st.empty()&&h[st.top()]>h[i])
        {
            st.pop();
        }
        if(st.empty())
        {
            r[i]=n;
        }
        else r[i]=st.top()-1;
        st.push(i);
    }
    ll ans=0;
    for(int i=1;i<=n;i++)
    {
        ll tmp1=s[i-1]-s[l[i]-1],tmp2=s[r[i]]-s[i];
        ans=(ans+get(tmp1,tmp2,i))%MOD;
        ans=(ans+calc(h[i],w[i]))%MOD;
        //cout<<i<<" "<<l[i]<<" "<<r[i]<<" "<<tmp1<<" "<<tmp2<<" "<<get(tmp1,tmp2,i)<<'\n';
    }
    cout<<ans;
}
/*5
5 9 49 32 4
1 1 1 1 1
*/

Subtask #1
0.0 / 0.0

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

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 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 0 ms 2396 KB Output is correct
3 Correct 7 ms 3560 KB Output is correct
4 Correct 11 ms 4956 KB Output is correct
5 Correct 12 ms 4732 KB Output is correct
6 Correct 11 ms 4572 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 2 ms 2908 KB Output is correct
3 Correct 7 ms 4180 KB Output is correct
4 Correct 14 ms 5876 KB Output is correct
5 Correct 16 ms 5980 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 2 ms 2908 KB Output is correct
4 Correct 7 ms 4188 KB Output is correct
5 Correct 25 ms 5828 KB Output is correct
6 Correct 26 ms 5980 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 2 ms 2908 KB Output is correct
9 Correct 9 ms 4172 KB Output is correct
10 Correct 14 ms 5724 KB Output is correct
11 Correct 16 ms 5724 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 0 ms 2396 KB Output is correct
8 Correct 0 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2396 KB Output is correct
12 Correct 0 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 0 ms 2396 KB Output is correct
15 Correct 0 ms 2396 KB Output is correct
16 Correct 1 ms 2392 KB Output is correct

Subtask #7
27.0 / 27.0

# 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 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 0 ms 2396 KB Output is correct
8 Correct 0 ms 2396 KB Output is correct
9 Correct 0 ms 2396 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 6 ms 3656 KB Output is correct
12 Correct 11 ms 4956 KB Output is correct
13 Correct 12 ms 4700 KB Output is correct
14 Correct 11 ms 4700 KB Output is correct
15 Correct 0 ms 2396 KB Output is correct
16 Correct 2 ms 2892 KB Output is correct
17 Correct 7 ms 4188 KB Output is correct
18 Correct 16 ms 5744 KB Output is correct
19 Correct 15 ms 5872 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 2 ms 2908 KB Output is correct
22 Correct 7 ms 4208 KB Output is correct
23 Correct 16 ms 5724 KB Output is correct
24 Correct 14 ms 5936 KB Output is correct
25 Correct 0 ms 2396 KB Output is correct
26 Correct 1 ms 2648 KB Output is correct
27 Correct 0 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 0 ms 2396 KB Output is correct
30 Correct 2 ms 2652 KB Output is correct
31 Correct 2 ms 2652 KB Output is correct
32 Correct 8 ms 3932 KB Output is correct
33 Correct 8 ms 3932 KB Output is correct
34 Correct 17 ms 5212 KB Output is correct
35 Correct 16 ms 5212 KB Output is correct
36 Correct 15 ms 5468 KB Output is correct
37 Correct 18 ms 5468 KB Output is correct
38 Correct 0 ms 2396 KB Output is correct
39 Correct 14 ms 5516 KB Output is correct
40 Correct 14 ms 5468 KB Output is correct
41 Correct 14 ms 5352 KB Output is correct
42 Correct 14 ms 5724 KB Output is correct