- [SPOJ #8725 CLOPPAIR "Closest Point Pair"\[难度:低\]](https://www.spoj.com/problems/CLOPPAIR/)
- [CODEFORCES Team Olympiad Saratov - 2011 "Minimum amount"\[难度:中\]](http://codeforces.com/contest/120/problem/J)
- [SPOJ #7029 CLOSEST "Closest Triple"\[难度:中\]](https://www.spoj.com/problems/CLOSEST/)
-- [Google CodeJam 2009 Final "Min Perimeter"\[难度:中\]](https://codingcompetitions.withgoogle.com/codejam/round/0000000000432ad5/0000000000433195)
+- [Google Code Jam 2009 Final "Min Perimeter"\[难度:中\]](https://codingcompetitions.withgoogle.com/codejam/round/0000000000432ad5/0000000000433195)
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