詳見代碼

應該會明白這個的意思

#include <iostream>
#include <algorithm>
using namespace std;
typedef long long ll;
inline ll read(){
    ll x=0,f=1; char ch=getchar();
    while(!isdigit(ch)) ch==‘-‘&(f=-1),ch=getchar();
    while(isdigit(ch)) x=(x<<1)+(x<<3)+(ch^48),ch=getchar(); return
 
 x*f;
}
int n;
const int N=1<<20;
int a[N];
signed main(){
    n=read();
    for(register int i=1;i<=n;i++) a[i]=read();
    sort(a+1,a+n+1);
    int find=read();
    int l=lower_bound(a+1,a+n+1,find)-a;
    int r=upper_bound(a+1,a+n+1,find)-a;
    cout<<l<<‘ ‘<<r<<endl;
    
 
return 0;
}

lower_bound &&upper_bound