MLE 与 RE

RT,我的代码不是MLE3个点就是RE3个点，求问数组开多大（用的dp求RMQ）

#include<bits/stdc++.h>
using namespace std;
long long n,m,a[1000005],dp[1000005][20];
long long rmq(long long l,long long r){
    long long k=log2(r-l+1);
    return min(dp[l][k],dp[r-(1<<k)+1][k]);
}

int main(){
//  freopen("P1440_2.in","r",stdin);
    std::ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>m;
    for(long long i=1;i<=n;i++){
        cin>>a[i];
        dp[i][0]=a[i];
    }
    for(long long j=1;j<=20&&(1<<j)<=n;j++){
        for(long long i=1;i+(1<<j)-1<=n;i++){
            dp[i][j]=min(dp[i][j-1],dp[i+(1<<j-1)][j-1]);
        }
    }
    cout<<0<<endl;
    for(long long i=1;i<=m;i++){
        cout<<rmq(1,i)<<endl;
    }
    for(long long i=m+1;i<n;i++){
        cout<<rmq(i-m+1,i)<<endl;;
    }
    return 0;
}