Median Smoothing

#include<bits/stdc++.h>
using namespace std;
const int maxn=500011;
const int inf=1<<27;
#define LL long long
#define P pair<int,int>
#define pb push_back
#define cl(a,b) memset(a,b,sizeof(a));

int a[maxn];
int main(){
    int n;
    while(~scanf("%d",&n)){
        for(int i=0;i<n;i++){
            scanf("%d",&a[i]);
        }
        int L=0,R=0;
        int ans=0;
        for(int i=1;i<n;i++){
            while(a[R]!=a[R+1]&&R+1<n)R++;
            int l=L+1,r=R-1;
            int tmp=0;
            while(l<=r){
                a[l]=a[L];a[r]=a[R];
                l++;r--;
                tmp++;
            }
            L=R=i;
            ans=max(ans,tmp);
        }

        printf("%d\n",ans);
        for(int i=0;i<n;i++){
            printf("%d%c",a[i],i==n-1?'\n':' ');
        }
    }
    return 0;
}