Do not learn, play games, doing puzzles
Puzzle 1:
Magic 20 * 20 * 20, 8000 a small cube, if stripping the outermost layer, but also the number of squares remaining?
Solution: stripped layer, the cube edge length -2, answer = 18 * 18 * 18 = 5832
Puzzles 2:
Two rings, radii are 1 and 2, the small circle within the great circle great circle around the circumference of the week, the small round their turn to ask for a few weeks? If their turn in the great circle of a few weeks it outside, small round?
solution:
= Distance of the center of the displacement movement of the ball
Movement inside the small circle distance = 2π * (2-1) = 2π = 1 circumferential
Movement distance outside the small circle = 2π * (2 + 1) = 6π = 3 circumferential
Puzzles 3:
A, B two playing charades, rules of the game are as follows:
A select a number between [1,100] B back on paper, then let B begin to guess; guess if small B, A will be prompted to B the guess is too small; once a particular guess B is too large, no longer prompts a, B after the small a guess would no longer be prompted only answer was right or not. I ask: B at least to guess () times in order to ensure guessed?
solution:
The first guess is assumed that N (big), the second biggest need guess N-1, N-2 requires maximum three times
Corresponds to a tolerance of arithmetic sequence 1: N (N + 1) / 2 ≥ 100
N = 14
Puzzles 4:
solution:
1. Horizontally , each row of each color has three grid , the third row dark gray and light gray grid has three, then? At the black grid must be 3
（B,D,E,F,G）
2. Horizontally, three grid is a vertical cross-2, then? At the black must be cross
（D,F,G）
3. The two-dimensional array of black, know each number 3, Items 2 1 3 3 3 3
深灰的二维数组为：[(2,3,2),(1,1,3),(3,1,x)]
浅灰的二维数组为：[(1,2,3),(3,2,2),(1,3,x)]
黑色的二维数组为：[(3,1,1),(2,3,1),(2,2,3)]
所以深灰色？处为2，浅灰色？处为1
选：F
智力题 5：
有十张扑克牌，每次可以只出一张，也可以只出两张，要出完有多少种出法
解：
def count(n):
if n < 1:
return -1
elif n == 1:
return 1
elif n == 2:
return 2
else:
return count(n-2) + count(n-1)
print(count(10))
输出：89（种）
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