cf/gym-101755H Safe Path 【BFS】
http://codeforces.com/gym/101755/problem/H
HDU-1045 Fire Net
https://vjudge.net/contest/283487#problem/F
cf/gym-101755H Safe Path 【BFS】
http://codeforces.com/gym/101755/problem/H
HDU-1045 Fire Net
https://vjudge.net/contest/283487#problem/F