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AT1894 総和
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problem/AT1894/AT1894.cpp
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18
problem/AT1894/AT1894.cpp
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#include <bits/stdc++.h>
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using namespace std;
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long long n, k, a[100005], f[100005], ans;
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int main() {
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cin >> n >> k;
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for (long long i = 1; i <= n; i++) {
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cin >> a[i];
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f[i] = f[i - 1] + a[i];
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}
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for (long long i = k; i <= n; i++) {
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ans += f[i] - f[i - k];
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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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