제출 #1121812

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1121812		raul2008487	Calvinball championship (CEOI15_teams)	C++17	10 / 100	60 ms	65536 KiB

teams

#include<bits/stdc++.h>

#define ll long long
#define pb push_back
#define in insert
#define fi first
#define se second
#define vl vector<ll>
#define all(v) v.begin(), v.end()
#define endl "\n"

using namespace std;
const int sz = 1e4 + 5; /// mind this
const int MAX = 2e6 + 123;
const int BS = 61;
const int mod = 1e6 + 7;
ll dp[sz][sz];
ll bp(ll a, ll b){
    ll res = 1;
    a %= mod;
    while(b){
        if(b & 1){
            res = (res * a) % mod;
        }
        a = (a * a) % mod;
        b >>= 1;
    }
    return res;
}
void solve(){
    ll n, i, j, hi = 0, ans = 0;
    cin >> n;
    vl v(n + 1), fp(n + 1, -1);
    for(i = 1; i <= n; i++){
        cin >> v[i];
        hi = max(hi, v[i]);
        if(fp[v[i]] == -1 ){
            fp[v[i]] = i;
        }
        dp[i][1] = 1;
    }
    for(i = 1; i <= n; i ++){
        for(j = 2; j <= hi; j++){
            if(i < fp[j]){break;}
            dp[i][j] = (dp[i - 1][j - 1] + (dp[i - 1][j] * j) % mod) % mod;
        }
    }
    for(i = 1; i <= hi; i++){
        ans = (ans + dp[n][i]) % mod;
    }
    cout << ans << endl;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    ll t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
}

/*

*/

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