{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"n个点(n \u003c\u003d 1e5), m条**有向**边(m \u003c\u003d 2e5), 最多之能删掉(m / 2)条边, 让其不成环,输出删除的边数和其索引号i(1 \u003c\u003d i \u003c\u003d m)"}},{"title":"样例输入1","value":{"format":"MD","content":"\u003cpre class\u003d\"jsk-text-danger jsk-text-default jsk-padding-vertical-xs jsk-margin-top-0 jsk-margin-bottom-lg\" id\u003d\"id0084901552065275610002\"\u003e2 2\n1 2\n2 1\u003c/pre\u003e"}},{"title":"样例输出1","value":{"format":"MD","content":"\u003cpre class\u003d\"jsk-text-danger jsk-text-default jsk-padding-vertical-xs jsk-margin-top-0 jsk-margin-bottom-lg\" id\u003d\"id00256547893397510050004\"\u003e1\n2\u003c/pre\u003e"}},{"title":"样例输入2","value":{"format":"MD","content":"\u003cpre class\u003d\"jsk-text-danger jsk-text-default jsk-padding-vertical-xs jsk-margin-top-0 jsk-margin-bottom-lg\" id\u003d\"id0067919991491362450006\"\u003e3 3\n1 2\n2 3\n3 1\u003c/pre\u003e"}},{"title":"样例输出2","value":{"format":"MD","content":"\u003cpre class\u003d\"jsk-text-danger jsk-text-default jsk-padding-vertical-xs jsk-margin-top-0 jsk-margin-bottom-lg\" id\u003d\"id002307047089561820008\"\u003e1\n1\u003c/pre\u003e"}},{"title":"样例输入3","value":{"format":"MD","content":"\u003cpre class\u003d\"jsk-text-danger jsk-text-default jsk-padding-vertical-xs jsk-margin-top-0 jsk-margin-bottom-lg\" id\u003d\"id00401927716098725800010\"\u003e4 5\n1 2\n1 3\n3 2\n2 4\n3 4\u003c/pre\u003e"}},{"title":"样例输出3","value":{"format":"MD","content":"\u003cpre class\u003d\"jsk-text-danger jsk-text-default jsk-padding-vertical-xs jsk-margin-top-0 jsk-margin-bottom-lg\" id\u003d\"id002485353709198534500012\"\u003e0\u003c/pre\u003e"}}]}