指纹通知从发出到寄到用了33天,已经错过了预约时间# Immigration - 落地生根
c*a
1 楼
实现两个功能
1. add(pair(a,b)) //a is in front of b,
add (pair(b,c)) // b is in front of c, so a is in front of c too,
2. query isFrontof(x, y) // return true if x is in front of y,
要求add 和query的timeComplexity 都是最优的。
1. add(pair(a,b)) //a is in front of b,
add (pair(b,c)) // b is in front of c, so a is in front of c too,
2. query isFrontof(x, y) // return true if x is in front of y,
要求add 和query的timeComplexity 都是最优的。