Submission #1295680

#	Time	Username	Problem	Language	Result	Execution time	Memory
1295680		ulvix	Calvinball championship (CEOI15_teams)	C++20	0 / 100	3 ms	1092 KiB

teams

#include <bits/stdc++.h>
#ifdef ULVI
    #define db(x)          cerr<<"[ "<<#x<<" = "<<(x)<<" ]\n"
    #define dbv(v)         cerr<<#v<<" = [ ";for(auto &__x : v)cerr<<__x<<' ';cerr<<"]\n"
    #define line()         cerr<<string(80, '-')<<'\n'
#else
    #define db(x)
    #define dbv(v)
    #define line()
#endif
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define ff first
#define ss second
#define enld endl
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<ll,ll> pll;
const ll sz=2e5+100;
const ll mod=1000007;
const ll inf=1e18;
template<class T>
using indexed_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
map<pll,ll> dp;
ll f(ll i,ll j){
    if(i==0) return 1;
    if(!dp.count({i,j})) return dp[{i,j}];
    return dp[{i,j}]=(j*f(i-1,j)+f(i-1,j+1))%mod;
}
void solve(){
    ll n;
    cin>>n;
    vector<ll> v(n+5);
    for(ll i=1;i<=n;i++) cin>>v[i];
    ll ans=1,mx=1;
    for(ll i=2;i<=n;i++){
        ans=(ans+min(v[i]-1,mx)*f(n-i,mx))%mod;
        mx=max(mx,v[i]);
    }
    cout<<ans<<'\n';
}

int main(){
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll t=1;
    //cin>>t;
    for(ll _=1;_<=t;_++){
        //cout<<"Scenario #"<<_<<":\n";
        solve();
    }
}

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