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12847.cpp
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53 lines (35 loc) · 720 Bytes
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//
// 12847.cpp
// algo
//
// Created by 박효정 on 2021/07/20.
//
#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,m;
long long tmp=0;
cin>>n>>m;
vector<long long>sum(n);
vector<int>v(n);
for(int i=0;i<n;i++){
cin>>v[i];
tmp+=v[i];
sum[i]=tmp;
}
long long res=0;
for(int i=0;i<n;i++){
if(i-m>=0){
res=max(res,sum[i]-sum[i-m]);
}else{
res=max(res,sum[i]);
}
}
cout<<res<<"\n";
return 0;
}