{"problem":{"name":"正常血压","description":{"content":"监护室每小时测量一次病人的血压，若收缩压在 $90\\sim 140$ 之间并且舒张压在 $60\\sim 90$ 之间(包含端点值)则称之为正常，现给出某病人若干次测量的血压值，计算病人保持正常血压的最长小时数。","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":"LGB2151"},"statements":[{"statement_type":"Markdown","content":"监护室每小时测量一次病人的血压，若收缩压在 $90\\sim 140$ 之间并且舒张压在 $60\\sim 90$ 之间(包含端点值)则称之为正常，现给出某病人若干次测量的血压值，计算病人保持正常血压的最长小时数。\n\n## Input\n\n第一行为一个正整数 $n(n<100)$，其后有 $n$ 行，每行 $2$ 个正整数，分别为一次测量的收缩压和舒张压。\n\n## Output\n\n输出仅一行，血压连续正常的最长小时数。\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"LGB2151","tags":["循环结构"],"sample_group":[["4\n100 80\n90 50\n120 60\n140 90","2"]],"created_at":"2026-03-03 11:09:25"}}