View Compilation Error

0_0_37261828_14190.cpp: In function 'int main()':
0_0_37261828_14190.cpp:40:37: error: 'strcmp' was not declared in this scope
      if (strcmp(List[key][j].name, s) == 0)//为什么是[key][j]来访问呢？—List[key]访问到的是node类型，
                                     ^