暴力能过8个点？！

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#define MAXN 10010
using namespace std;
int n,m,a[MAXN];
bool b[MAXN*100];
int main(){
    int x,y,s;
    char f[2];
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
    scanf("%d",&a[i]);
    while(m--){
               scanf("%s",f);
               scanf("%d%d",&x,&y);
               s=0;
               memset(b,false,sizeof(b));
               if(f[0]=='Q'){
                             for(int i=x;i<=y;i++)
                             if(b[a[i]]==false){
                                                b[a[i]]=true;
                                                s++;}
                             printf("%d\n",s);
                             }
               if(f[0]=='R')
               a[x]=y;
               }
    return 0;
}