Guess My Age

A group of $N$ people (numbered $1$ through $N$) claimed that Chef is only good at cooking, but nothing else. Chef wanted to prove them wrong, so he accepted a challenge from them to guess their ages. The $N$ people gave Chef $M$ pieces of information to help him. Each piece of information is described by four integers $t$, $u$, $v$ and $c$ with the following meaning: - If $t = 1$, the $u$-th per