Submission #63644

#	Time	Username	Problem	Language	Result	Execution time	Memory
63644		khohko	Calvinball championship (CEOI15_teams)	C++17	20 / 100	24 ms	7648 KiB

teams

#include<bits/stdc++.h>
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)1e9+7)
#define mi(a,b) a=min((a),(b))

ll n,m,k,p,l,r,q;
ll a[ARRS];
int f[1005][1005][2];

ll slv(ll i,ll c,ll e=0){
	if(i==n)return 1;
	if(f[i][c][e])return f[i][c][e]-1;
	if(e){
		f[i][c][e]=c*slv(i+1,c,e)+slv(i+1,c+1,e)+1;
		return f[i][c][e]-1;
	}
	else {
		ll pas=0;
		if(a[i]==c+1){
			pas+=c*slv(i+1,c,1);
			pas+=slv(i+1,c+1,0);
		}
		else {
			pas+=(a[i]-1)*slv(i+1,c,1);
			pas+=slv(i+1,c,0);
		}
		pas%=MOD;
		f[i][c][e]=pas+1;
		return pas;
	}
}

int main(){
	#ifdef KHOKHO
			freopen("in.in","r",stdin);
			freopen("out.out","w",stdout);
	#endif
	cin>>n;
	for(int i=0; i<n; i++)cin>>a[i];
	cout<<slv(0,0,0);
}

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