老题了，附上黄学长链接一发，直接改改就AC了，http://hzwer.com/1216.html

#include 
      
       #include 
       
        #include 
        
         using namespace std;const int N=1e4+5;int num[N],sum[N],l[N*2],r[N*2],a[N];int n;int get(int x){    int p,ans=0;    memset(sum,0,sizeof(sum));    memset(l,0,sizeof(l));    memset(r,0,sizeof(r));    for(int i=1;i<=n;i++)    {        if(a[i]>x)num[i]=1;        else if(a[i]==x){num[i]=0;p=i;}        else num[i]=-1;    }    l[n]=1;r[n]=1;    for(int i=p-1;i>=1;i--)       {sum[i]=sum[i+1]+num[i];l[sum[i]+n]++;}    for(int i=p+1;i<=n;i++)       {sum[i]=sum[i-1]+num[i];r[sum[i]+n]++;}    for(int i=0;i<=2*n-1;i++)ans+=l[i]*r[2*n-i];    return ans;}int main(){    while(~scanf("%d",&n)){      for(int i=1;i<=n;++i)       scanf("%d",&a[i]);      for(int i=1;i