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mod 5
개수 세고 둘의 차를 출력
pq
처음에 두 수 연결하는걸 string으로했다가 정렬할때 다시 숫자로 바꿔야해서 그냥 처음부터 숫자로 연결하게 바꿈
(
to_string이O(N)으로 알고있음)조합 만드는것도 구현 잘못해서 고생했다..
모든 i < k < j에 대해 dist[i][k] + dist[k][j] = dist[i][j] 를 확인하면 되지 않을까 했는데 WA
1 -> 2, 2 -> 3, 2 -> 4 이런 경우 dist[2][4] + dist[2][3] = dist[3][4] 라서 안된다
트리 어렵다