{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"## 提交按鈕在左側\n\n## The submit button is on the left"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre\u003e6\n1 3\n2 3\n3 4\n4 5\n4 6\n0\n2\n1 2\n-1\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre\u003e2\n1\u003c/pre\u003e"}}]}