#include <bits/stdc++.h>
using namespace std;
const int N=10005,M=1e9+7;
int x,k,dp[N][1<<10][11],dp2[N][51],a[N];
int rec(int i,int msk,int lst){
if(i>k)return 0;
if((msk^(1<<lst))==0)return k-i+1;
if(~dp[i][msk][lst])return dp[i][msk][lst];
int ret=rec(i+1,msk,lst);
if(ret>=M)ret-=M;
for(int nxt=0;nxt<x;nxt++)
if(msk&(1<<nxt)){
ret+=rec(i+max(a[lst+1],a[nxt+1]),msk^(1<<lst),nxt);
if(ret>=M)ret-=M;
}
return dp[i][msk][lst]=ret;
}
int rec2(int i,int j){
if(i>k)return 0;
if(j==1)return k-i+1;
if(~dp2[i][j])return dp2[i][j];
long long ret=(((rec2(i+a[1],j-1)*1LL*j)%M)+(rec2(i+1,j)%M))%M;
return dp2[i][j]=ret;
}
int main(){
ios::sync_with_stdio(0);cin.tie(0);
cin>>x>>k;
bool f=1;
for(int i=1;i<=x;i++)cin>>a[i],f&=(a[i]==a[1]);
if(!f){
memset(dp,-1,sizeof(dp));
long long sum=0;
for(int i=0;i<x;i++)sum=(sum+rec(1,(1<<x)-1,i))%M;
cout<<sum;
}else{
memset(dp2,-1,sizeof(dp2));
cout<<rec2(1,x);
}
return 0;
}
Compilation message
Main.cpp:19:2: error: extended character is not valid in an identifier
19 | if(i>k)return 0;
| ^
Main.cpp:20:2: error: extended character is not valid in an identifier
20 | if(j==1)return k-i+1;
| ^
Main.cpp:21:2: error: extended character is not valid in an identifier
21 | if(~dp2[i][j])return dp2[i][j];
| ^
Main.cpp: In function 'int rec2(int, int)':
Main.cpp:19:2: error: '\U000000a0if' was not declared in this scope
19 | if(i>k)return 0;
| ^~~
