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Gradually, Xiao Ming and Xiao Hong discovered that there are many Sudoku fans all over the world. They decided to open a live broadcast room on Douyu to solve Sudoku live. In order to show his ingenuity, Xiao Ming randomly selects a Sudoku submitted by fans from the fan club before the start of each week. During the live broadcast, Xiao Ming will tell Xiao Hong the solution, and then Xiao Hong will watch the live broadcast using a zero-knowledge proof method. The old irons proved that the problem was solved and knew the solution for themselves. The old irons expressed 666 and sent them to the airplane and rocket. In this way, the popularity of Xiao Ming and Xiao Hong's live broadcast room skyrocketed, and the two became the contracted artists of Douyu.
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One day, Xiao Ming came to Xiaohong's home to prepare to broadcast a very difficult Sudoku, but he found that he had solved the problem at his own home. Time is running out, and if you have to recalculate the designation for failing to catch up with the start time, you will be scolded by the boss of Douyu. But he and Xiaohong decided to start broadcasting. Before the broadcast, Xiaoming and Xiaohong said: "Let’s pretend to get a zero knowledge proof. I will tell you how I choose the test method. You just need to make sure that the test method I choose (each row, or each column, Or the numbers in each Jiugongge) don't repeat." Xiaohong agreed.
Xiao Gang, after watching the live broadcast at his home, Xiao Ming and Xiao Hong told Xiao Gang about their method of fraud this time. Xiao Gang outraged them and reprimanded them, "What is the difference between you doing this and Lu Benwei's hanging up! I am worthy of supporting you." Fans of? I don’t believe the zero-knowledge proof of the two of you anymore!"