Submission #234722

#	Time	Username	Problem	Language	Result	Execution time	Memory
234722		Goolakh	Calvinball championship (CEOI15_teams)	C++17	10 / 100	371 ms	736 KiB

teams

// Do you knOW what it feels like?

		// To be TorTured by your own MinD?

	// I don't wanna feel the PAIN.

// I BeG you to KILL me, pleASE...

#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O2")
#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("Os")

#define F first
#define S second
#define pb push_back
#define SZ(x) (ll)(x.size())
#define all(x) x.begin(),x.end()

typedef int ll;
typedef pair<ll,ll> pll;

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll maxn=1e4+10, lg=20, mod=1e9+7, inf=1e18;

ll n;
long long dp[2][maxn],ans=1;
pll ad[maxn];

int main(){
	ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	
	cin>>n;
	ll mx=0;
	for(int i=1;i<=n;i++){
		ll x; cin>>x;
		ad[n-i]={mx,x-1};
		//cout<<n-i<<' '<<mx<<' '<<x-1<<endl;
		mx=max(mx,x);
	}
	for(int j=0;j<=n;j++) dp[0][j]=1;
	for(int ii=1,i,gi;ii<=n;ii++){ i=ii%2; gi=1-i;
		ans+=dp[gi][ad[ii-1].F]*ad[ii-1].S%mod, ans%=mod;
		for(int j=1;j<=n;j++) dp[i][j]=((dp[gi][j]*j%mod)+dp[gi][j-1])%mod;
	}
	cout<<ans;
	
	return 0;
}

Compilation message (stderr)

teams.cpp:27:45: warning: overflow in implicit constant conversion [-Woverflow]
 const ll maxn=1e4+10, lg=20, mod=1e9+7, inf=1e18;
                                             ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 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