1 2
3 Since Takahashi scored $1$ point, we see that he solved only the $1$\-point problem and failed to solve the other two. Similarly, since Aoki scored $2$ points, we see that he solved only the $2$\-point problem and failed to solve the other two. Therefore, Snuke must have solved the $1$\- and $2$\-point problems, but not the $4$\-point one, which Takahashi and Aoki both failed to solve, for a score of $3$ points. Thus, $3$ should be printed.
5 3
7 Since Takahashi scored $5$ points, we see that he solved the $1$\- and $4$\-point problems but not the $2$\-point one. Similarly, since Aoki scored $3$ points, we see that he solved the $1$\- and $2$\-point problems but not the $4$\-point one. Therefore, each of the three problems is solved by at least one of Takahashi and Aoki, so we see that Snuke solved all of the problems, for a score of $7$ points. Thus, $7$ should be printed.
0 0
0 Both Takahashi and Aoki solved none of the problems. Therefore, so did Snuke. Thus, $0$ should be printed.
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