def dimacs_convert_graph(filename):
    with open(filename, 'r') as f:
        for line in f:
            line = line.strip()

            if line.startswith('c'):
                continue

            elif line.startswith('p'):
                _, _, n, e = line.split()
                nodes = int(n)
                edges = int(e)
                adj = [[] for _ in range(nodes + 1)]
            
            elif line.startswith('a'):
                _, u, v, w = line.split()
                u, v, w = int(u) - 1, int(v) - 1, int(w)
                
                adj[u].append((v, w))
    
    return nodes, adj