Submission #1694721

---

Source Code Expand

#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#define REP(i, m, n) for(int i=int(m);i<int(n);i++)
#define EACH(i, c) for (auto &(i): c)
#define all(c) begin(c),end(c)
#define EXIST(s, e) ((s).find(e)!=(s).end())
#define SORT(c) sort(begin(c),end(c))
#define pb emplace_back
#define MP make_pair
#define SZ(a) int((a).size())

//#define LOCAL 0
//#ifdef LOCAL
//#define DEBUG(s) cout << (s) << endl
//#define dump(x)  cerr << #x << " = " << (x) << endl
//#define BR cout << endl;
//#else
//#define DEBUG(s) do{}while(0)
//#define dump(x) do{}while(0)
//#define BR
//#endif


//改造
typedef long long int ll;
using namespace std;
#define INF (1 << 20)
#define INFl (ll)5e15
#define DEBUG 0 //デバッグする時1にしてね

//ここから編集する

int main() {

    int N, K;
    cin >> N >> K;
    vector<ll> a(N), b(N);
    vector<ll> acc_a(N + 1, 0), acc_b(N + 1, 0);
    REP(i, 0, N) {
        cin >> a[i];
        b[i] = max(0LL, a[i]);
    }

//K個の連続する0以上や0以下を調べる
    REP(i, 0, N) {
        acc_a[i + 1] = acc_a[i] + a[i];
        acc_b[i + 1] = acc_b[i] + b[i];
    }
    //a[x] ~ a[y] の累積和 is acc_a[y+1] - acc_a[x]


    ll ans = 0;
    REP(i,K,N+1){
        //acc_a[i - K] ~ acc_a[i-1]は塗りつぶすやつ
        //acc_b[0] ~ acc_b[i-K-1] と acc_b[i] ~ acc_b[N-1]までのWA
        ll sub1 = max(acc_a[i] - acc_a[i-K],0LL);
        ll sub2 = (acc_b[i-K] - acc_b[0]) + (acc_b[N] - acc_b[i]);
        ans = max(ans,sub1 + sub2);

    }

    cout << ans << endl;


    return 0;
}

Submission Info

Judge Result