过了但是求解答

void add_edge(int u, int v, int w) {
	edge[++tot] = {v, head[u], w};
	head[u] = tot;
}

void add_edge(int u, int v, int w) {
	if (minEdge[u][v] != 0 && w >= minEdge[u][v]) return;
	minEdge[u][v] = w;
	edge[++tot] = {v, head[u], w};
	head[u] = tot;
}