Difference between revisions of "CTU Open Contest 2019"
Jump to navigation
Jump to search
Line 7: | Line 7: | ||
题解:如果 $C\neq A$ 且 $C \neq B$,则不会出现。 | 题解:如果 $C\neq A$ 且 $C \neq B$,则不会出现。 | ||
− | 否则如果 $A | + | 否则如果 $A=B$,则出现 $K$ 次。 |
否则,出现 $K \ctimes 2^{K-1}$ 次。 | 否则,出现 $K \ctimes 2^{K-1}$ 次。 |
Revision as of 08:24, 22 February 2020
Problem A
Solved by Kilo_5723. 00:36 (+5)
题意:求在所有由 $A$ 和 $B$ 组成的 $K$ 位数中,$C$ 出现的次数。
题解:如果 $C\neq A$ 且 $C \neq B$,则不会出现。
否则如果 $A=B$,则出现 $K$ 次。
否则,出现 $K \ctimes 2^{K-1}$ 次。
Problem B
Solved by Xiejiadong. 02:34(+)
按照题目意思计算即可。
题目却是比较难理解,看着样例大概猜了猜。
Problem C
Solved by Kilo_5723. 03:04 (+3)
Problem D
Solved by Xiejiadong. 04:08 (+)
Problem E
Solved by Weaver_zhu. 03:37 (+1)
Problem F
Solved by Kilo_5723. 02:05 (+1)
Problem G
Solved by Kilo_5723. 01:33 (+2)
Problem H
Solved by Xiejiadong. 02:53 (+2)
相对比较大的模拟题。时间顺序比较难处理(主要是题目没讲清楚)。
Problem I
Solved by Weaver_zhu. 4:07 (+3)
Problem J
Solved by Weaver_zhu. 02:20 (+)