dd-bond

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Gym 101986D Making Perimeter of the Convex Hull Shortest(凸包+极角排序)

POJ 3743 LL’s cake(圆+PSLG)

POJ 3549 GSM phone(圆+扫描线+最短路)

HDU 6697 Closest Pair of Segments(线段距离)

HDU 6617 Enveloping Convex(凸包+半平面交+二分)

HDU 6631 line symmetric(枚举)

Codeforces 1159D The minimal unique substring(构造)

Codeforces 1255F Point Ordering (凸包+叉积)

Codeforces 1262E Arson In Berland Forest(二维前缀和+二维差分+二分)

Codeforces 1262D Optimal Subsequences(BIT+二分)