Submission #790903

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
790903	2023-07-23 09:20:25	12345678	Fancy Fence (CEOI20_fancyfence)	C++17	100 / 100	30 ms	8716 KiB

fancyfence

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll nx=1e5+5, mod=1e9+7;
ll n, ans, h, w, sm, H[nx], W[nx];
stack<pair<pair<ll, ll>, ll>> s;
ll cal(ll x)
{
    return (x*(x+1)/2)%mod;
}
int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=0; i<n; i++) cin>>H[i];
    for (int i=0; i<n; i++) cin>>W[i];
    for (int i=0; i<n; i++)
    {
        ll h=H[i], w=W[i];
        ans=(ans+(cal(h)*cal(w))%mod)%mod;
        ll sw=0;
        while (!s.empty()&&s.top().first.first>h)
        {
            sw=(sw+s.top().first.second)%mod;
            sm=((sm-s.top().second)%mod+mod)%mod;
 
 
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• Subtask 1: 0 / 0
• Subtask 2: 12 / 12
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 18 / 18
• Subtask 7: 27 / 27