14531453 SUSTech Online Judge
This problem is in Contest(s) below:
Contest 1104:CS203 2021 Fall Lab 07 Tree
Contest 1124:CS203 2022 Fall Lab 6 Tree
Contest 1125:CS217 2022 Fall Lab 6 Tree
Contest 1103:CS217 2021 Fall Lab 07 Tree
Contest 1148:CS203 2023 Fall Lab 6 Tree