Due to large input file size, each input file has been partitioned into $$$t$$$ smaller files, each with $$$1$$$ test case ($$$t = 1$$$). Below are the differences between the original problem and the problem on Codeforces:
1 7 28 1 2 3 1 2 4 1 2 5 1 2 6 1 2 7 1 3 4 1 3 5 1 3 6 1 3 7 1 4 5 1 4 6 1 4 7 1 5 6 1 5 7 1 6 7 2 3 4 2 3 5 2 3 6 2 3 7 2 4 5 2 4 6 2 4 7 2 5 6 2 5 7 2 6 7 3 4 5 3 4 6 3 4 7
1 2 3 4 7