{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"求区间[a,b]有多少个素数"}},{"title":"Input","value":{"format":"MD","content":"多组输入,第一行是t表示有t组数据,接下来每行一对a,b"}},{"title":"Output","value":{"format":"MD","content":"输出\"Case x:\"后再输出答案"}},{"title":"Sample Input","value":{"format":"MD","content":"```\n3\n2 36\n3 73\n3 11\n```"}},{"title":"Sample Output","value":{"format":"MD","content":"```\nCase 1: 11\nCase 2: 20\nCase 3: 4\n```"}},{"title":"Note","value":{"format":"MD","content":"```\nt ≤ 200\n1 ≤ a ≤ b \u003c 2^31, b - a ≤ 100000\n```\n"}}]}