luogu_P1638 逛画展

#include<iostream> 
#include<cstdio>

#define ri register int
#define u int

namespace opt {
    
    inline u in() {
        u x(0),f(1);
        char s(getchar());
        while(s<‘0‘||s>‘9‘) {
            if(s==‘-‘) f=-1;
            s=getchar();
        }
        while(s>=‘0‘&&s<=‘9‘) {
            x=(x<<1)+(x<<3)+s-‘0‘;
            s=getchar();
        }
        return x*f;
    }
    
}

using opt::in;

#define NN 1000005

namespace mainstay {
    
    u N,M,cnt,ans[3]={0x7fffffff},vt[NN],a[NN];
    
    inline void solve(){
        N=in(),M=in();
        for(ri i(1);i<=N;++i) a[i]=in();
        u l(1),r(0);
        while(1){
            if(l>=N||r>=N) break;
            if(!vt[a[r+1]]) ++cnt;
            ++vt[a[++r]];
            while(cnt==M){
                if(r-l+1<ans[0]){
                    ans[0]=r-l+1,ans[1]=l,ans[2]=r;
                }
                --vt[a[l++]];
                if(!vt[a[l-1]]) --cnt;
            }
        }
        std::cout<<ans[1]<<" "<<ans[2];
    }
    
}

int main() {
    
    //freopen("x.txt","r",stdin);
    std::ios::sync_with_stdio(false);
    mainstay::solve();
    
}