Submission #394993

#	Time	Username	Problem	Language	Result	Execution time	Memory
394993		Pichon5	Fancy Fence (CEOI20_fancyfence)	C++17	0 / 100	20 ms	316 KiB

fancyfence

#include<bits/stdc++.h>
#define lcm(a,b) (a/__gcd(a,b))*b
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define F first
#define S second
#define mp make_pair
//salida rapida "\n"
//DECIMALES fixed<<sp(n)<<x<<endl;
//gcd(a,b)= ax + by
//lCB x&-x
//set.erase(it) - ersases the element present at the required index//auto it = s.find(element)
//set.find(element) - iterator pointing to the given element if it is present else return pointer pointing to set.end()
//set.lower_bound(element) - iterator pointing to element greater than or equal to the given element
//set.upper_bound(element) - iterator pointing to element greater than the given element
// | ^
//__builtin_popcount(x)
using namespace std;
const ll MOD=1e9+7;
vll h,w;
long long bin(long long x){
	x %= MOD;
    return ((x*(x+1))/2)%MOD;
}
long long T(long long x, long long y){
    return (bin(x)*bin(y))%MOD;
}

int main()
{ 
    ll n,x;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>x;
        h.pb(x);
    }
    ll res=0;
    for(int i=0;i<n;i++){
        cin>>x;
        w.pb(x);
        res=(res+T(h[i],w[i]))%MOD;
    }
    for(int i=0;i<n;i++){
        ll H=h[i];
        ll W=w[i];
        for(int l=i+1;l<n;l++){
            H=min(H,h[l]);
            W=(W+w[l])%MOD;
            res=(res+T(H,W))%MOD;
            res=(res-T(H,W-w[i]))%MOD;
            res=(res-T(H,W-w[l]))%MOD;
            res=(res-T(H,W-w[i]-w[l]))%MOD;
        }

    }
    cout<<res<<endl;
 
    
    return 0;
}

• 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