D. Swap Free

Codeforces

IDCF10242D

Time1000ms

Memory512MB

Difficulty—

English · Original

Formal · Original

[samples]

**Definitions** Let $ t \in \mathbb{Z} $ be the number of test cases. Let $ T = \{(n_k, A_k) \mid k \in \{1, \dots, t\}\} $ be the set of test cases, where for each $ k $: - $ n_k \in \mathbb{Z} $ denotes the length of the sequence. - $ A_k = (a_{k,1}, a_{k,2}, \dots, a_{k,n_k}) $ is a sequence of integers. **Constraints** 1. $ 1 \le t \le 1000 $ 2. For each $ k \in \{1, \dots, t\} $: - $ 1 \le n_k \le 50 $ - $ 1 \le a_{k,i} \le 100 $ for all $ i \in \{1, \dots, n_k\} $ **Objective** For each test case $ k \in \{1, \dots, t\} $, compute: $$ S_k = \sum_{i=1}^{n_k} (-1)^{i-1} a_{k,i} $$

API Response (JSON)

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