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15961.cpp
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83 lines (53 loc) · 1.16 KB
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//
// 15961.cpp
// algo
//
// Created by 박효정 on 2021/08/10.
//
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main(){
cin.tie(0);
cout.tie(0);
std::ios::sync_with_stdio(false);
int n,d,k,c;
cin>>n>>d>>k>>c;
vector<int>v(n+n);
for(int i=0;i<n;i++){
cin>>v[i];
}
for(int i=n;i<n+n;i++){
v[i]=v[i-n];
}
int lt=0;
int rt=0;
int cnt=0;
int res=0;
vector<int>vis(d+1);
while(lt<=n+k){
if(lt-rt<=k-1){
if(vis[v[lt]]==0){
cnt++;
vis[v[lt++]]++;
}else{
vis[v[lt++]]++;
}
}else{
if(vis[v[rt]]==1){
cnt--;
}
vis[v[rt++]]--;
}
if(lt-rt==k){
if(vis[c]==0){
res=max(res,cnt+1);
}else{
res=max(res,cnt);
}
}
}
cout<<res<<"\n";
return 0;
}