ACLPC G
from AtCoder Library Practice Contest
ACLPC_G
G - SCC
https://gyazo.com/3f039350389b2300aa35f5bf74deb838
strongly-coupled component decompose
Strongly connected component - Wikipedia
Semantics and Algorithms of Strongly Connected Component Decomposition | The Beautiful Story of High School Mathematics
ei1333's page C++
Search depth-first and number in order of return.
Reverse the edges and perform depth-first search again in the order of the previous number. The traced range is the strongly connected component
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