Week 5: Searching (練習題)
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[CODEFORCES 1131C Birthday](https://codeforces.com/contest/1131/problem/C)
[CODEFORCES 1042A Benches](https://codeforces.com/contest/1042/problem/A)
[CODEFORCES 919B Perfect Number](https://codeforces.com/contest/919/problem/B)
[CODEFORCES 978C Letters](https://codeforces.com/contest/978/problem/C)
[CODEFORCES 1138A Sushi for Two](https://codeforces.com/contest/1138/problem/A)
[CODEFORCES 750A New Year and Hurry](https://codeforces.com/contest/750/problem/A)
[CODEFORCES 888C K-Dominant Character](https://codeforces.com/contest/888/problem/C)

[CODEFORCES 1099B Squares and Segments](https://codeforces.com/contest/1099/problem/B)
[CODEFORCES 706B Interesting drink](https://codeforces.com/contest/706/problem/B)
\* [CODEFORCES 1117C Magic Ship](https://codeforces.com/contest/1117/problem/C)