{"problem":{"name":"[语言月赛 202501] 数字谜","description":{"content":"给出一个两位数 $a$，问至少要把 $a$ 加上几（可以 $+0$），才能让 $a$ 的个位变成 $b$。","description_type":"Markdown"},"platform":"Luogu","limit":{"time_limit":1000,"memory_limit":524288},"difficulty":{"LuoguStyle":"P1"},"is_remote":true,"is_sync":true,"sync_url":null,"sign":"LGB4120"},"statements":[{"statement_type":"Markdown","content":"给出一个两位数 $a$，问至少要把 $a$ 加上几（可以 $+0$），才能让 $a$ 的个位变成 $b$。\n\n## Input\n\n输入有一行两个自然数 $a,b$，含义同题目描述。\n\n## Output\n\n输出一行一个自然数表示答案。\n\n[samples]\n\n## Note\n\n【样例 1 解释】\n\n$47+2=49$，个位为 $9$。\n\n【样例 2 解释】\n\n$89+4=93$，个位为 $3$。\n\n【样例 3 解释】\n\n$a$ 的个位已经是 $0$，所以最少只要增加 $0$。\n\n【数据范围】\n\n$10\\le a\\le 90, 0\\le b\\le 9$。","is_translate":false,"language":"English"}],"meta":{"iden":"LGB4120","tags":["2025","顺序结构","语言月赛"],"sample_group":[["47 9\n","2\n"],["89 3\n","4\n"],["30 0\n","0\n"]],"created_at":"2026-03-03 11:09:25"}}