2-101 => 1,102-201 => 2,202-301 => 3. how to solve this problem

2-101 & gt; 1,102-201 & gt; 2,202-301 & gt; 3... 2, 3, 4 ...... 101 generate, 4 ...... 201 generate, 4 ...... 201 generate 3302,3, 4 ...... 301 generate listen 2, 3, 4 ...... 401 generate 5 ------ solution --------------- 2-101 ==> 1,102-201 ==> 2,202-301 ==> 3...
2, 3, 4... 101 = generate 1
201, 4... = generate 2
201 = generate 3
301 = generate 4
401 = generate 5

------ Solution --------------------
101, 4... = generate 1 //
N02, 3, 4... n01 = generate n + 1

------ Solution --------------------
$ N = 2;
Echo ceil ($ n-1)/100 );

You can verify it by yourself.

For ($ n = 2; $ n <2002; $ n ++)
Echo $ n, ':', ceil ($ n-1)/100), PHP_EOL;