Submission #243841

#	Time	Username	Problem	Language	Result	Execution time	Memory
243841		errorgorn	Calvinball championship (CEOI15_teams)	C++14	70 / 100	19 ms	16512 KiB

teams

//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl;

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

ll MAX(ll a){return a;}
ll MIN(ll a){return a;}
template<typename... Args>
ll MAX(ll a,Args... args){return max(a,MAX(args...));}
template<typename... Args>
ll MIN(ll a,Args... args){return min(a,MIN(args...));}

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

const int MOD=1000007;

int n;
int arr[1005];
ll memo[1005][1005];

ll dp(int i,int j){
	if (i==n-1) return 1;
	if (memo[i][j]!=-1) return memo[i][j];
	
	return memo[i][j]=(dp(i+1,j+1)+dp(i+1,j)*j)%MOD;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	memset(memo,-1,sizeof(memo));
	
	cin>>n;
	rep(x,0,n) cin>>arr[x];
	
	ll ans=1;
	int mx=0;
	rep(x,0,n){
		ans=(ans+dp(x,mx)*(arr[x]-1))%MOD;
		mx=max(mx,arr[x]);
	}
	
	cout<<ans<<endl;
}

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