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19 lines
435 B
C++
19 lines
435 B
C++
#include <bits/stdc++.h>
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using namespace std;
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const int N = 2e5 + 5;
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long long a[N];
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int main() {
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int n;
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scanf("%d", &n);
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for (int i = 0; i < n; i++) scanf("%lld", a + i);
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long long ans = 0, cut = numeric_limits<long long>::max();
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for (int i = n - 1; i >= 0; i--) {
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cut = min(cut - 1, a[i]);
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if (cut <= 0) break;
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ans += cut;
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}
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printf("%lld", ans);
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return 0;
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} |