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47
Luogu/P3594/P3594.cpp
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47
Luogu/P3594/P3594.cpp
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#include <iostream>
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#include <deque>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e6 + 5;
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int n, d, a[N], ans;
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long long p, sum, s[N], t[N];
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std::deque<int> q;
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> p >> d;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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s[i] = s[i - 1] + a[i];
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}
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for (int i = 1; i <= n; i++) {
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t[i] = s[i] - s[i - d];
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}
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ans = d;
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sum = s[d + 1];
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q.push_back(d);
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for (int i = d + 1, l = 1, r = 0; i <= n; sum += a[++i]) {
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while (!q.empty() && t[q.back()] <= t[i]) q.pop_back();
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q.push_back(i);
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while (sum - t[q.front()] > p) {
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if (q.front() < l + d) q.pop_front();
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sum -= a[l++];
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}
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ans = std::max(ans, i - l + 1);
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}
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cout << ans << endl;
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return 0;
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}
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