{"problem":{"name":"连续出现的字符","description":{"content":"给定一个字符串，在字符串中寻找第一个连续出现次数不低于 $k$ 次的字符。","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":131072},"difficulty":{"LuoguStyle":"P1"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGB2126"},"statements":[{"statement_type":"Markdown","content":"给定一个字符串，在字符串中寻找第一个连续出现次数不低于 $k$ 次的字符。\n\n## Input\n\n$2$ 行。第 $1$ 行是 $k$；第 $2$ 行是仅包含大小写字母的字符串。\n\n## Output\n\n字符串中第一个连续出现次数不低于 `k` 次的字符。如果没有符合条件的字符，输出 `No`。\n\n[samples]\n\n## Note\n\n$1\\leq k\\leq1000$，字符串长度不超过 $1000$。","is_translate":false,"language":"English"}],"meta":{"iden":"LGB2126","tags":["字符串（入门）"],"sample_group":[["3\nabcccaaab","c"]],"created_at":"2026-03-03 11:09:25"}}