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最近和小盆友们一起在苦逼找工作，发现美国这边IT公司喜欢问一些小智力题，感觉蛮有意思的，分享给大家！
1.There are 9 tennis balls, 8 are exactlly the same(color, weight) one is little heavier than others. And a two-side balance scale, with this balance scale,
Give the minimum number you can find the heavier ball.
Analysis:
Best: one time. divide 8 balls into 2 teams, 4 &4. the left one is the heavy one.
Average: Every time divide into 3 teams.
First, 3 teams with 3balls, we could find the heavy team with weighing one time.
Second, divide the heavy team into 3 teams with 1 ball. we could find the heavy one weighing one time.
这种方案两次就能找出来。
2. 69 * 71 ==？what is your solution, process?
(70-1)*(70+1) = 4900-1 = 4899
or 70 * 7
这种题对于在国内上过高二的同学来说，应该没有难度吧
3. There is a chess board with 8 rows and 8 column.How many totally number of square it have?
注意这里的square 是指任意边长的正方形 从1--8
solution:
For length1: 8*8 = 64;
For length2 7*7 = 49
For length3 6*6 = 36
For length4 5*5 = 25
For length5 4*4 = 16
For length6 3*3 = 9
For length7 2*2 = 4
For length8 1*1 =1
Totally: 1+4+9+16+25+36+49+64 = 204
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