Submission #863339

#	Time	Username	Problem	Language	Result	Execution time	Memory
863339		honanhphong	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	3 ms	6644 KiB

fancyfence

#include<bits/stdc++.h>
using namespace std;
using lli = long long;
const int mod = 1e9 + 7;
const int maxn = 1e6;
lli s[maxn], h[maxn], w[maxn], b[maxn], c[maxn];
vector <lli> v;
int main()
{
    lli n;
    cin >> n;
    for (lli i = 1; i <= n; i ++)
    {
        cin >> h[i];
    }
    for (lli i = 1; i <= n; i ++)
    {
        cin >> w[i];
    }
    for (lli i = 1; i <= n; i ++)
    {
        s[i] = s[i - 1] + w[i];
    }
    lli k = 0;
    for (lli i = 1; i <= n; i ++)
    {
        while (!v.empty() && h[v.back()] > h[i])
        {
            v.pop_back();
        }
        if (v.empty())
        {
            k ++;
            b[k] = 0;
        } else
        {
            k ++;
            b[k] = s[v.back()];
        }
        v.push_back(i);
    }
    while (!v.empty())
    {
        v.pop_back();
    }
    k = 0;
    for (lli i = n; i >= 1; i --)
    {
        while (!v.empty() && h[v.back()] >= h[i])
        {
            v.pop_back();
        }
        if (v.empty())
        {
            k ++;
            c[k] = s[n] + 1;
        } else
        {
            k ++;
            c[k] = s[v.back()];
        }
        v.push_back(i);
    }
    lli res = 0, j = n;
    for (lli i = 1; i <= n; i ++)
    {
        lli p = (h[i] + 1) * h[i] / 2;
        lli q = (w[i] + 1) * w[i] / 2;
        lli r = c[j] - b[i] - w[i];
        res += (p * q * r);
        res %= mod;
        cout << res << " " << c[j] << " "  << b[i] << " " << r << endl;
        j --;
    }
    cout << res % mod;
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27