未完成~

http://www.lydsy.com/JudgeOnline/problem.php?id=2120

#include <algorithm>
#include <cstdio>
#include <cmath>

using namespace std;

const int N(110);
int n,m,col[N*N];

#define MAX(a,b) (a>b?a:b)
#define MIN(a,b) (a<b?a:b)
int cnt,str[N],ove[N],bel[N];
int now[N*N],cc[N][N*N],sum[N];
void Build()
{
    int C=sqrt(n);
    for(int i=1;i<=n;i+=C)
    {
        str[++cnt]=i;
        ove[cnt]=MIN(n,i+C-1);
    }
    for(int i=1;i<=cnt;i++)
        for(int j=str[i];j<=ove[i];bel[j++]=i)
            if(!cc[i][col[j]]) cc[cnt][col[j]]++,sum[i]++;
}
void Change(int u,int x)
{
    if(!cc[bel[u]][x]) sum[bel[u]]++;
    cc[bel[u]][x]++;
}
int Query(int u,int v)
{
    int ret=0;
    for(int i=bel[u];i<=bel[v];i++)
        if(str[i]>=u&&ove[i]<=v) ret+=sum[i];
        else for(int j=MAX(str[i],u);j<=MIN(ove[i]);j++)
                ret+=
}

int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
        scanf("%d",col+i),now[i]=col[i];
    Build();
    for(char ch[2];m--;)
    {
        scanf("%s%d%d",ch,&u,&v);
        if(ch[0]=='R') Change(u,v);
        else printf("%d\n",Query(u,v));
    }
    return 0;
}