4
No For $N=4$, there is no way to light up the ropes to satisfy the conditions, so the output `No` is correct. Below is an example of an output in the `Yes` case, **which is incorrect in this case.** This is because, for $(a, b, c) = (1, 2, 3)$ in **Condition 2**, the rope connecting $a, b$ is red, the rope connecting $b, c$ is white, and the rope connecting $a, c$ is blue, all of which have different colors. Yes RBW WB R
{
"problem": {
"name": "Christmas Wreath",
"description": {
"content": "Takahashi has Christmas decoration consisting of $N$ balls and $\\frac{N(N-1)}{2}$ ropes. The balls are numbered $1$ to $N$, and for any two different balls, there is exactly one rope that connects the",
"description_type": "Markdown"
},
"platform": "AtCoder",
"limit": {
"time_limit": 3000,
"memory_limit": 262144
},
"difficulty": "None",
"is_remote": true,
"is_sync": true,
"sync_url": null,
"sign": "arc131_e"
},
"statements": [
{
"statement_type": "Markdown",
"content": "Takahashi has Christmas decoration consisting of $N$ balls and $\\frac{N(N-1)}{2}$ ropes. The balls are numbered $1$ to $N$, and for any two different balls, there is exactly one rope that connects the...",
"is_translate": false,
"language": "English"
}
]
}