case 1 failed: expected "0\n2\n7 6\n2\n9 8\n1\n7\n1\n8\n1\n7\n1\n8\n1\n1\n1\n11\n1\n11\n1\n7\n1\n7\n1\n7\n1\n4\n2\n2 1\n1\n8\n1\n8" got "0\n\n2\n6 7\n2\n8 9\n1\n7\n1\n8\n1\n7\n1\n8\n1\n1\n1\n11\n1\n11\n1\n7\n1\n7\n1\n7\n1\n4\n2\n1 2\n1\n8\n1\n8"
input:
1
11 17
+--++-+-+++
10 11
6 7
8 9
5 9
7 11
7 7
8 10
1 1
11 11
11 11
6 8
1 9
6 8
4 4
1 2
7 11
7 9
exit status 1