{"problem":{"name":"找第一个只出现一次的字符","description":{"content":"给定一个只包含小写字母的字符串，请你找到第一个仅出现一次的字符。如果没有，输出 `no`。","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":"LGB2110"},"statements":[{"statement_type":"Markdown","content":"给定一个只包含小写字母的字符串，请你找到第一个仅出现一次的字符。如果没有，输出 `no`。\n\n## Input\n\n一个字符串，长度小于 $1100$。\n\n## Output\n\n输出第一个仅出现一次的字符，若没有则输出 `no`。\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"LGB2110","tags":["字符串（入门）"],"sample_group":[["abcabd","c"],["aabbcc","no"]],"created_at":"2026-03-03 11:09:25"}}