Submission #1121781

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121781		vjudge1	Calvinball championship (CEOI15_teams)	C++17	20 / 100	1066 ms	1016 KiB

teams

#include "bits/stdc++.h"
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define pb push_back
#define in insert
#define F first
#define S second
#define vll vector<ll>
#define all(v) v.begin(),v.end()
#define endl '\n'
#define pii pair<ll,ll>
using namespace std;
const ll INF =1e18, mod = 1e9 + 7, N = 1e5 + 5;
ll f[N];
ll modpow(ll a,ll b){
    ll ans = 1;
    while(b>0){
        if(b%2==1){
            ans*=a;
            ans%=mod;
        }
        a*=a;
        a%=mod;
        b/=2;
    }
    return ans;
}
 
ll inv(ll a){
    return (modpow(a,mod-2)) % mod;
}
ll C(ll a,ll b){
     return(f[a] * inv(f[b] * f[a-b] % mod)) % mod;
}
ll maxi,q = 1;
ll n;
ll cnt(ll w, ll e){
    if(e > n){
        return 0;
    }
    if(w == 0){
        return 1;
    }
    return(((cnt(w - 1, e) * e ) % mod) + (cnt(w - 1, e + 1) % mod) ) % mod;
}
void solve(){
    cin >> n;
    ll a[n];
    set<ll>s;
    
    for(int i = 1; i <= n; i++){
        cin >> a[i];//1 2 2 
        for(int j = 1; j < a[i]; j++){
            q = (q + cnt(n - i,maxi)) % mod; /// space element      
        }/// 1 , 2      0,2 
        maxi = max(a[i], maxi);
    }
    cout << q % mod<< endl;
}
int main(){
    fast;
    ll t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10