Runaround Numbers Runaround numbers are integers with unique digits, none of which is zero (e.g., 81362) that also have an interesting property, exemplified by this demonstration: If you start at the left digit (8 in our number) and count that number…
典型的找欧拉路径的题.先贴下USACO上找欧拉路径的法子: Pick a starting node and recurse on that node. At each step: If the node has no neighbors, then append the node to the circuit and return If the node has a neighbor, then make a list of the neighbors and process them (wh…