{"trustable":true,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv\u003eGiven a \u003ci\u003eM\u003c/i\u003e×\u003ci\u003eN\u003c/i\u003e matrix \u003ci\u003e\u003cb\u003eA\u003c/b\u003e\u003c/i\u003e. \u003ci\u003e\u003cb\u003eA\u003c/b\u003e\u003c/i\u003e\u003csub\u003eij\u003c/sub\u003e ∈ {0, 1} (0 ≤ i \u0026lt; M, 0 ≤ j \u0026lt; N), could you find some rows that let every cloumn contains and only contains one 1. \u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cdiv\u003eThere are multiple cases ended by \u003cb\u003eEOF\u003c/b\u003e. Test case up to 500.The first line of input is \u003ci\u003eM\u003c/i\u003e, \u003ci\u003eN\u003c/i\u003e (\u003ci\u003eM\u003c/i\u003e ≤ 16, \u003ci\u003eN\u003c/i\u003e ≤ 300). The next \u003ci\u003eM\u003c/i\u003e lines every line contains \u003ci\u003eN\u003c/i\u003e integers separated by space. \u003c/div\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cdiv\u003eFor each test case, if you could find it output \"Yes, I found it\", otherwise output \"It is impossible\" per line. \u003c/div\u003e"}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3 3\r\n0 1 0\r\n0 0 1\r\n1 0 0\r\n4 4\r\n0 0 0 1\r\n1 0 0 0\r\n1 1 0 1\r\n0 1 0 0\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eYes, I found it\r\nIt is impossible\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}