Submission #63653

#	Time	Username	Problem	Language	Result	Execution time	Memory
63653		khohko	Calvinball championship (CEOI15_teams)	C++17	90 / 100	1058 ms	1020 KiB

teams

#include<bits/stdc++.h>
//#pragma GCC optimize("O3")
using namespace std;
#define ll long long
#define pb push_back
#define fr first
#define sc second
#define ARRS ((ll)(2e6+500))
#define MAX ((ll)(1e6+100))
#define MOD ((ll)1e6+7)
#define mi(a,b) a=min((a),(b))

ll n,m,k,p,l,r,q;
ll a[20000];
ll f[2][10005][2];



int main(){
	#ifdef KHOKHO
			freopen("in.in","r",stdin);
			freopen("out.out","w",stdout);
	#endif
	ios::sync_with_stdio(0);
	cin>>n;
	for(int i=0; i<n; i++)cin>>a[i];
	ll N=0,P=1;
	for(ll i=n; i>=0; i--){
		for(ll c=n; c>=0; c--){
			for(ll e=0; e<2; e++){
				if(i==n){f[N][c][e]=1;continue;}
				f[N][c][e]=0;
				if(e)
					f[N][c][e]=c*f[P][c][e]+f[P][c+1][e];
				else {
					if(a[i]==c+1){
						f[N][c][e]+=c*f[P][c][1];
						f[N][c][e]+=f[P][c+1][0];
					}
					else {
						f[N][c][e]+=(a[i]-1)*f[P][c][1];
						f[N][c][e]+=f[P][c][0];
					}
				}
				f[N][c][e]%=MOD;
			}
		}
		swap(N,P);
	}
	cout<<f[P][0][0];
}

• 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: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10