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- #include <bits/stdc++.h>
- #define ll long long
- #define ull unsigned long long
- #define pi 3.141592654
- #define NUM 1e18
- #define Mod 1'000'000'007
- #define fixed(n) fixed<<setprecision(n)
- #define cin(v) for(auto &i:v) cin >> i ;
- #define cout(v) for(auto &i:v) cout << i <<" ";
- #define vowel(x) (x=='e'||x=='a'||x=='i'||x=='o'||x=='u')
- #define small(x) (x>=97&&x<=122)
- #define capital(x) (x>=65&&x<=90)
- #define Tolower(s) transform(s.begin(),s.end(),s.begin(),::tolower);
- #define Toupper(s) transform(s.begin(),s.end(),s.begin(),::toupper);
- #define all(v) ((v).begin()), ((v).end())
- #define allr(v) ((v).rbegin()), ((v).rend())
- #define updmax(a,b) a=max(a,b)
- #define updmin(a,b) a=min(a,b)
- #define ceil(a,b) ((a/b)+(a%b?1:0))
- /* asc -> 1 2 3 ,des -> 3 2 1 */
- /***********************************************************************************/
- using namespace std;
- void Rofyda_Elghadban(){
- #ifndef ONLINE_JUDGE
- freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
- #endif
- ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
- }
- void solve(){
- int n,k;
- cin>>n>>k;
- vector<int>v(n+1),t(n+1),v2;
- for(int i=1;i<n+1;i++){
- cin>>v[i];
- }
- for(int i=1;i<n+1;i++){
- cin>>t[i];
- }
- for(int i=0;i<n+1;i++){
- if(t[i]==1){
- v2.push_back(v[i]);
- }else if(t[i]==0||i==0){
- v2.push_back(0);
- }
- }
- int prefix1[100001]{},prefix2[100001]{},pre=0;
- for(int i=1;i<n+1;i++){
- prefix1[i]=v[i]+prefix1[i-1];
- }
- for(int i=1;i<n+1;i++){
- prefix2[i]=v2[i]+prefix2[i-1];
- }
- int l=1,r=l+k-1,maxi=INT_MIN,s1=0,s=0,s2=0;
- for(int i=1;i<n+1;i++){
- s1=prefix2[l-1]-prefix2[0];
- s=prefix1[r]-prefix1[l-1];
- s2=prefix2[n]-prefix2[r-1];
- maxi=max(maxi,(s1+s+s2));
- if(r<=n){
- l++;
- r++;
- s1=0;
- s=0;
- s2=0;
- }
- }
- cout<<maxi<<"\n";
- }
- int main(){
- Rofyda_Elghadban();
- //freopen("input.txt","r",stdin);
- //freopen("output.txt","r",stdout);
- solve();
- return 0;
- }
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