{"problem":{"name":"Ordinary Number","description":{"content":"We have a permutation $p$ = {$p_1,\\ p_2,\\ ...,\\ p_n$} of {$1,\\ 2,\\ ...,\\ n$}. Print the number of elements $p_i$ ($1 < i < n$) that satisfy the following condition: *   $p_i$ is the second smallest n","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc132_b"},"statements":[{"statement_type":"Markdown","content":"We have a permutation $p$ = {$p_1,\\ p_2,\\ ...,\\ p_n$} of {$1,\\ 2,\\ ...,\\ n$}.\nPrint the number of elements $p_i$ ($1 < i < n$) that satisfy the following condition:\n\n*   $p_i$ is the second smallest number among the three numbers $p_{i - 1}$, $p_i$, and $p_{i + 1}$.\n\n## Constraints\n\n*   All values in input are integers.\n*   $3 \\leq n \\leq 20$\n*   $p$ is a permutation of {$1,\\ 2,\\ ...,\\ n$}.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$n$\n$p_1$ $p_2$ $...$ $p_n$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc132_b","tags":[],"sample_group":[["5\n1 3 5 4 2","2\n\n$p_2 = 3$ is the second smallest number among $p_1 = 1$, $p_2 = 3$, and $p_3 = 5$. Also, $p_4 = 4$ is the second smallest number among $p_3 = 5$, $p_4 = 4$, and $p_5 = 2$. These two elements satisfy the condition."],["9\n9 6 3 2 5 8 7 4 1","5"]],"created_at":"2026-03-03 11:01:14"}}