Practice · 3 of 4

Range Add, Point Query

CHALLENGE

Difficulty: intermediate+25 XP

**Bài toán.** Zero-initialized array of size n, q operations: 1 l r v adds v to [l, r]; 2 p prints a[p]. **Constraints:** 1 ≤ n, q ≤ 200 000; |v| ≤ 10^9; answers fit in long long.

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