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Chef and Sub Array

                      Chef and Sub Array



#include <iostream>
#include <stdio.h>
#define sf(i) scanf("%d", &i)
#define pf(i) printf("%d\n", i)

using namespace std;

int n, k, p;
int a[100005], b[300005];
int sum[300005], tree[700005];
string s;

void buildTree(int index, int s, int e)
{
    if(s == e)
    {
        tree[index] = sum[s];
    }
    else
    {
        int mid = (s + e) / 2;
        buildTree(2 * index + 1, s, mid);
        buildTree(2 * index + 2, mid + 1, e);

        tree[index] = max(tree[2 * index + 1], tree[2 * index + 2]);
    }
}

int query(int index, int s, int e, int qs, int qe)
{
    if(qs > e || qe < s)
        return 0;

    if(qs <= s && qe >= e)
        return tree[index];

    int mid = (s + e) / 2;
    int left = query(2 * index + 1, s, mid, qs, qe);
    int right = query(2 * index + 2, mid + 1, e, qs , qe);

    return max(left, right);

}
int main()
{
    sf(n), sf(k), sf(p);
    if(k > n)
        k = n;

    for(int i = 0; i < n; i++)
    {
        sf(a[i]);
        b[i] = b[i + n] = a[i];
    }

    cin >> s;

    sum[0] = b[0];

    for(int i = 1; i < k; i++)
    {
        sum[i] = sum[i - 1] + b[i];
    }
    for(int i = k; i < 2 * n; i++)
    {
        sum[i] = sum[i - 1] - b[i - k] + b[i];
    }

    buildTree(0, 0, 2 * n - 1);

    int index = n;
    for(int i = 0; i < p; i++)
    {
        if(s[i] == '!')
        {
            index--;
            if(index == 0)
                index = n;
        }
        else
        {
            int ans;
            if(k < n)
            {
                ans = query(0, 0, 2 * n - 1, index + k - 1, index + n - 1);
            }
            else
            {
                ans = query(0, 0, 2 * n - 1, n, 2 * n - 1);
            }
            pf(ans);
        }
    }
    return 0;
}

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