Curated
8| # | Title | Difficulty | Source | Tags | |
|---|---|---|---|---|---|
| 11 | The odd shakers are even | Easy | Lemma | ||
| 629 | Edges of a complete graph | Easy | Lemma | ||
| 630 | Edges of a tree | Easy | Lemma | ||
| 631 | The handshake lemma | Easy | Lemma | ||
| 632 | Counting faces | Easy | Classical | ||
| 633 | Colouring a pentagon | Easy | Lemma | ||
| 1 | A party of six | Medium | Lemma | ||
| 634 | Spanning trees of K₄ | Medium | Classical |
From open sources
9Complete problems only, with worked solutions first. Show everything
| # | Title | Difficulty | |
|---|---|---|---|
| 128434 | Graph Basics · Example 1 | Easy | |
| 128435 | Graph Basics · Example 2 | Easy | |
| 128437 | Graph Structures · Example 2 | Easy | |
| 128438 | Graph Structures · Example 3 | Easy | |
| 128444 | Applying Connectedness | Easy | |
| 128445 | Hamilton Cycles · Example 1 | Easy | |
| 128448 | Traveling Salesperson Problem · Example 1 | Easy | |
| 128449 | Traveling Salesperson Problem · Example 2 | Easy | |
| 128446 | Hamilton Cycles · Example 2 | Easy |