Submission #900636

#	Time	Username	Problem	Language	Result	Execution time	Memory
900636		karamkallasi	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	13 ms	51844 KiB

fancyfence

#include <bits/stdc++.h>
#define T ll tt ; cin>>tt ; while(tt--)
#define fast ios::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
#define endl '\n'
#define yes void (cout << "YES" << endl)
#define no void (cout << "NO" << endl)
#define pb push_back
#define F first
#define S second
#define ld long double
#define fixed(g) fixed<<setprecision(g)
#define ll long long
using namespace std;
const ll N = 2e6 + 9 ;
const ll oo = 1e9 + 7 ;
ll n , m , k , x , y , z , g , ans , sum , sum2 , cnt , dis[N] ,  sz , mn , a[N] , b[N] ;
bool ff , vis[N] ;
queue<pair<ll , ll> >q;
set<pair<ll , ll> >st;
vector<pair<ll , ll> >v[N] ;
int main(){
fast
    cin >> n ;
    for(ll i=0 ; i<n ; i++)cin >> a[i] ;
    for(ll i=0 ; i<n ; i++)cin >> b[i] ;
    for(ll i=0 ; i<n ; i++){
        sum+=b[i];
        sum %= oo ;
    }
    for(ll i=0 ; i<n ; i++){
        if(a[i]==2){
            x+=b[i] ;
        }
        else {
            g = (x%oo) * ((x+1)%oo) ;
            g/=2 ;
            ans+= (g%oo) ;
            x = 0 ;
            ff = 0 ;
        }
    }
    if(x){
        ans+= (x%oo) * ((x+1)%oo) / 2 ;
    }
  //  cout << ans <<' '<<sum << ' ';
    cout << ans + (sum%oo) * ((sum+1)%oo) /2  << 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