📅  最后修改于: 2022-03-11 15:01:12.535000             🧑  作者: Mango
Input:
N = 3
M[][] = {{0 1 0},
{0 0 0},
{0 1 0}}
Output: 1
Explanation: 0th and 2nd person both
know 1. Therefore, 1 is the celebrity.