{"trustable":false,"sections":[{"title":"题目大意","value":{"format":"HTML","content":"T组数据,给你一个有向图,让你判断是否有两点单连通。"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre class\u003d\"sio\"\u003e1\n3 3\n1 2\n2 3\n3 1\n\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre class\u003d\"sio\"\u003eYes\u003c/pre\u003e"}}]}