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leetcode/code/lc621.java at master · mJackie/leetcode · GitHub
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lc621.java
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lc621.java
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package
code
;
/*
* 621. Task Scheduler
* 题意:一系列任务,相同任务之间至少有n个时间间隔,问最少执行时间
* 难度:Medium
* 分类:Array, Greedy, Tree
* 思路:统计出出现次数最多的那个任务的出现次数,再统计下和他相同次数的任务个数,返回 (max-1)*(n+1)+count 即可
* Tips:
*/
public
class
lc621
{
public
int
leastInterval
(
char
[]
tasks
,
int
n
) {
int
[]
map
=
new
int
[
26
];
int
max
=
0
;
for
(
char
ch
:
tasks
) {
map
[
ch
-
'A'
] +=
1
;
max
=
Math
.
max
(
map
[
ch
-
'A'
],
max
);
}
int
count
=
0
;
for
(
int
i
:
map
){
if
(
i
==
max
)
count
++;
}
return
Math
.
max
(
tasks
.
length
, (
max
-
1
)*(
n
+
1
)+
count
);
// max-1 不算最后一个周期, 最后一个周期时间是count,间隔为n,周期为n+1
}
}
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