Status Title Difficulty
501. Single Zero Numbers Level 5
502. Simultaneous Data Backup Level 3
503. Radical Product Evaluation 1 Level 3
504. Nonagon Diagonals Count Level 4
505. Even Integer Count Level 2
506. Polygon Side Calculation Level 5
507. Balloon Height Calculation Level 3
508. Tiny Fraction Approximation Level 4
509. Card Drawing Probability Level 5
510. Test Score Average Level 5
511. Arithmetic Operation Simplification Level 1
512. Odd Digit Integer Count 2 Level 5
513. Office Position Selection Level 3
514. Negative Root Squaring Level 2
515. Class Average Calculation Level 3
516. Decimal Division Level 2
517. Algebraic Equation Solving 4 Level 2
518. Exponential Expression Calculation 2 Level 3
519. Relatively Prime Integer Search Level 5
520. Cookie Ratio Scaling Level 2