Quiz https://www.hackerrank.com/contests/yfkpo3-2/challenges/bananas-multiplier-easy https://www.hackerrank.com/contests/yfkpo3-2/challenges/bananas-multiplier-hard (hardも通る)解法 (0-indexedとする) 頂点0からの最短距離（辺の本数）を各頂点…