考场上空间开大了一倍就爆0了QAQ…

#include
     
      #include
      
       #include
       
        using namespace std;const int maxn = 21;int height[30], pos[30];long long dp[1 << maxn][21];int main(){    int n, delta;    scanf("%d%d",&n,&delta);    for(int i = 1;i <= n + 1; ++i) pos[i] = (1 << (i - 1)) ;    for(int i = 1;i <= n; ++i) scanf("%d",&height[i]);    for(int i = 1;i <= n; ++i) dp[pos[i]][i] = 1;        for(int i = 1;i < pos[n + 1]; ++i)    {        for(int j = 1;j <= n; ++j)        {            if((i & pos[j]) == 0) continue;            int mx = i ^ pos[j];            if(mx == 0) continue;            for(int k = 1;k <= n; ++k)            {                if( (i & pos[k]) == 0 || k == j || abs(height[j] - height[k]) <= delta) continue;                dp[i][j] += dp[mx][k];            }        }    }    long long fin = 0;    for(int i = 1;i <= n; ++i) fin += dp[pos[n + 1] - 1][i];    printf("%lld",fin);    return 0;}