easy
medium
hard
extreme
100

4+4

8

100

9+9

18

100

120+537

657

100

1,000+1,000

2,000

200

6+6

12

200

11+4

15

200

134+134

268

200

9,000+9,000

1,000,000

300

7+3

10

300

12+6

18

300

135+135

270

300

6,000+6,000

12,000

400

10+5

15

400

11+9

20

400

425+652

1,077

400

122+122

244

500

11+11

22

500

12+12

24

500

100+700

800

500

425+561

987

500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500
500