You are given a 0-indexed array of positive integers tasks, representing tasks that need to be completed in order , where tasks[i] represents the type of the ith task.
You are also given a positive integer space, which represents the minimum number of days that must pass after the completion of a task before another task of the same type can be performed.
Each day, until all tasks have been completed, you must either:
Complete the next task from tasks, or
Take a break.
Return the minimum number of days needed to complete all tasks.
Input: tasks =[1,2,1,2,3,1], space =3Output: 9Explanation:
One way to complete all tasks in9 days is as follows:Day 1: Complete the 0th task.Day 2: Complete the 1st task.Day 3: Take a break.Day 4: Take a break.Day 5: Complete the 2nd task.Day 6: Complete the 3rd task.Day 7: Take a break.Day 8: Complete the 4th task.Day 9: Complete the 5th task.It can be shown that the tasks cannot be completed in less than 9 days.
Input: tasks =[5,8,8,5], space =2Output: 6Explanation:
One way to complete all tasks in6 days is as follows:Day 1: Complete the 0th task.Day 2: Complete the 1st task.Day 3: Take a break.Day 4: Take a break.Day 5: Complete the 2nd task.Day 6: Complete the 3rd task.It can be shown that the tasks cannot be completed in less than 6 days.
For each task, we check if it was last done within space days. If so, we must wait; otherwise, we can do it immediately. We update the last completion day for each task type.
We keep track of the last day each task type was completed. For each task, if it was last done more than space days ago, we can do it immediately; otherwise, we must wait until the required number of days have passed. We increment the current day accordingly.
import java.util.*;
classSolution {
publiclongtaskSchedulerII(int[] tasks, int space) {
Map<Integer, Long> last =new HashMap<>();
long day = 0;
for (int t : tasks) {
day++;
if (last.containsKey(t) && day - last.get(t) <= space) {
day = last.get(t) + space + 1;
}
last.put(t, day);
}
return day;
}
}
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classSolution {
funtaskSchedulerII(tasks: IntArray, space: Int): Long {
val last = mutableMapOf<Int, Long>()
var day = 0Lfor (t in tasks) {
day++if (last.containsKey(t) && day - last[t]!!<= space) {
day = last[t]!! + space + 1 }
last[t] = day
}
return day
}
}
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classSolution:
deftaskSchedulerII(self, tasks: list[int], space: int) -> int:
last: dict[int, int] = {}
day =0for t in tasks:
day +=1if t in last and day - last[t] <= space:
day = last[t] + space +1 last[t] = day
return day
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use std::collections::HashMap;
impl Solution {
pubfntask_scheduler_ii(tasks: Vec<i32>, space: i32) -> i64 {
letmut last: HashMap<i32, i64>= HashMap::new();
letmut day: i64=0;
for&t in&tasks {
day +=1;
iflet Some(&prev) = last.get(&t) {
if day - prev <= space asi64 {
day = prev + space asi64+1;
}
}
last.insert(t, day);
}
day
}
}