闲着无聊看下大一的杨辉三角，竟然写不出来了（java），正常吗？工作几年了

Question

闲着无聊看下大一的杨辉三角，竟然写不出来了（java），正常吗？工作几年了

Answer 1

Some things have less code, but think again and don’t measure the workload by the amount of code.
The multiplication table is a double for loop, and the binary word segmentation method is also a double for loop.

Nine-Nine Returns to One:

<?php
for ($x=1;$x<=9;$x++) {
    for ($y=1;$y<=$x;$y++) {
        echo $y.'*'.$x.'='.$y*$x."\t";
    }
    echo "\n";
}
for ($x=9;$x>=1;$x--) {
    for ($y=1;$y<=$x;$y++) {
        echo $y.'*'.$x.'='.$y*$x."\t";
    }
    echo "\n";
}
?>
1*1=1    
1*2=2    2*2=4    
1*3=3    2*3=6    3*3=9    
1*4=4    2*4=8    3*4=12    4*4=16    
1*5=5    2*5=10    3*5=15    4*5=20    5*5=25    
1*6=6    2*6=12    3*6=18    4*6=24    5*6=30    6*6=36    
1*7=7    2*7=14    3*7=21    4*7=28    5*7=35    6*7=42    7*7=49    
1*8=8    2*8=16    3*8=24    4*8=32    5*8=40    6*8=48    7*8=56    8*8=64    
1*9=9    2*9=18    3*9=27    4*9=36    5*9=45    6*9=54    7*9=63    8*9=72    9*9=81    
1*9=9    2*9=18    3*9=27    4*9=36    5*9=45    6*9=54    7*9=63    8*9=72    9*9=81    
1*8=8    2*8=16    3*8=24    4*8=32    5*8=40    6*8=48    7*8=56    8*8=64    
1*7=7    2*7=14    3*7=21    4*7=28    5*7=35    6*7=42    7*7=49    
1*6=6    2*6=12    3*6=18    4*6=24    5*6=30    6*6=36    
1*5=5    2*5=10    3*5=15    4*5=20    5*5=25    
1*4=4    2*4=8    3*4=12    4*4=16    
1*3=3    2*3=6    3*3=9    
1*2=2    2*2=4    
1*1=1

Binar participle:

<?php
if(preg_match_all('%[\x{4e00}-\x{9fa5}]%u', '天王盖地虎', $matches)) {
    //$matches[0] 为 array('天', '王', '盖', '地', '虎')
    $size = count($matches[0]);
    for($i=0;$i<=$size-2;$i++) {
        $word = '';
        for($j=0;$j<2;$j++) {
            $word .= $matches[0][$i+$j];
        }
        echo $word."\n";
    }
}
?>
天王
王盖
盖地
地虎

Answer 2

Absolutely not normal, it can’t even double-layer for circulate, are you sorry?

Answer 3

It’s normal. I’ve been working for several years and I’ve even forgotten what the Yang Hui Triangle is

Answer 4

It can’t be normal anymore

Answer 5

What is Wang Hui’s triangle?