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- n = int(input())
- a = list(map(int, input().split()))
- a = a[::-1]
- ans = a[0]
- last = a[0] - 1
- for i in range(1, n):
- ans += min(last, a[i])
- last = min(last, a[i]) - 1
- if last <= 0:
- break
- print(ans)
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