FB面经prepare: Task Schedule - neverlandly - 博客园


FB面经prepare: Task Schedule - neverlandly - 博客园
每种task都有冷却时间,比如task1执行后,要经过interval时间后才能再次执行,求总共所需时间。
用HashMap保存每一个task的下一次可以开始执行的最早时间
http://www.1point3acres.com/bbs/thread-161904-1-1.html
第二题是Task Schedule, 地里有面经。大致意思是每种task都有冷却时间,比如task1执行后,要经过interval时间后才能再次执行,求总共所需时间。
Sample 1 
tasks: 1, 1, 2, 1.  recovery interval: 2
output: 7  (order is 1 _ _ 1 2 _ 1)

Sample 2
tasks: 1, 2, 3, 1, 2, 3.  recovery interval: 3 鏉ユ簮涓€浜�.涓夊垎鍦拌鍧�. 
output: 7  (order is 1 2 3 _ 1 2 3)

一开始写了个bug,三姐让我描述一遍test case, 自己改了过来。followup是tasks是无序的,大致讲了一下思路,期间也让三姐提示了一下,时间就到了。问了几个问题结束。

 5     public int schedule(int[] str, int recover) {
 6         if (str==null || str.length==0) return 0;
 7         if (recover == 0) return str.length;
 8         int pos = 0;
 9         int time = 0;
10         HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
11         for (; pos<str.length; pos++) {
12             int cur = str[pos];
13             if (!map.containsKey(cur)) {
14                 map.put(cur, time+recover+1);
15             }
16             else {
17                 int lastApr = map.get(cur);
18                 if (time >= lastApr) {
19                     map.put(cur, time);
20                 }
21                 else {
22                     pos--;
23                 }
24             }
25             time++;
26         }
27         return time;
28     }
http://www.1point3acres.com/bbs/thread-161904-1-1.html
一开始是有序的,比如说1, 1, 2, 1,一定要先执行第一个task1,然后等task1恢复,再执行第2个task1,再执行task2..... followup是无序的,就是不用按给的顺序执行,也就是可以先执行task1,然后task1还没恢复时,先执行task2, etc......
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