Problem
代做Algorithm – 该题目是一个常规的Algorithm的练习题目代写, 是比较典型的Algorithm等代写方向
If we can know the time that we go from to , we could use bfs Algorithm from , and check if is connected to since we know the blocks that we can travel through. The bfs is defined by , which means all of the blocks with are not overrun by zombies and we could use bfs from. This bfs algorithm can extend from. If it is possible to travel to from , return true, otherwise return false. Then we use binary algorithm to find the answer. When we use binary algorithm, we have a to check. Use to check it. If then , else . At last, we could find the answer after binary algorithm. ‘s time complexity is. Binary algorithm invoke times. So all is
Let the graph is , If we know a possible answer , we can find that all of the edges satisfied that construct an edges set. We can use Coloring algorithm of bipartite graph at graph to check if , or. Know we can use Coloring algorithm of bipartite graph to check if a possible answer is feasible. Then we use binary algorithm to find the answer. At last, we could find the answer after binary algorithm. Coloring algorithm of bipartite graph’s time complexity is. Binary algorithm invoke it times. So all is
If , the answer is. If , then we can dfs every point with all of the roads and know the number of connected blocks. Let the number of connected blocks is , the blocks’ size is. For connected block, these points answer is. So
For all of the algorithm just use a dfs. The time complexity of dfs is. So all is