rank | solved | A | B | C | D | E | F | G | H | I | J | K |
---|---|---|---|---|---|---|---|---|---|---|---|---|
267 | 4 | Ø | O | . | . | O | ! | Ø | . | . | . | . |
A
UpSolved by Forsaken.
可以推出一个和调和级数前缀和有关的式子,分段打表即可。
B
Solved by XLor.
答案个数等于交点数加一,扫描线即可。
E
Solved by XLor.
G
UpSolved by XLor.
按直径剖分,讨论两种情况,打标记。
rank | solved | A | B | C | D | E | F | G | H | I | J | K |
---|---|---|---|---|---|---|---|---|---|---|---|---|
267 | 4 | Ø | O | . | . | O | ! | Ø | . | . | . | . |
UpSolved by Forsaken.
可以推出一个和调和级数前缀和有关的式子,分段打表即可。
Solved by XLor.
答案个数等于交点数加一,扫描线即可。
Solved by XLor.
UpSolved by XLor.
按直径剖分,讨论两种情况,打标记。