Check (1) forget to sort (2) typo of i and j (3) n = 1 / cout -1

Good Problems

0. Math
   • Statistics
     • edu 78 F (K-moment of binomial)
1. DP
   • Expection / Probabilities DP
     • 604 div2 D
   • Tree DP
     • 607 div1 D
   • Rooted Tree DP
     • 614 div1 C
   • Submask DP
     • 568 div2 F
   • Multi-DP / Seperated DP
     • 568 div2 G hard
2. Greedy
   • edu 78 D
3. Hash
   • Hello 2020 D
4. Graph
   • Sparse Graph Search
     • 589 div2 D
     • 599 div1 B
   • Strongly Connected Components
     • 545 div1 C
   • Minimum Cost Maximum Flow
     • edu 80 F
5. Tree
   • LCA
     • 620 div2 E
6. Data Structures
   • Treap / Ordered set
     • 567 div2 D
7. Geometry
   • Polar sort
     • Hello 2020 E
8. Randomization
   • Ozon2020
9. Games
   • edu 83 F
10. Strings
    • Z Function
      • 622 div2 E

• Some links
  • Brilliant: Learning Math
  • Rational Root Theorem
  • Factoring a polynominal function
  • The moment generating function
  • Z Function