母亲节做个花----制作 m 束花所需的最少天数

Posted 2021-06-06 秦枫-_-

class Solution {
    public int minDays(int[] bloomDay, int m, int k) {
      int nums=m*k;
      if(bloomDay.length<nums)return -1;
      int low=1,high=Arrays.stream(bloomDay).max().getAsInt();
      while(low<high){
          int mid=(low+high)/2;
        int count= check(bloomDay,mid,m,k);
        if(count<m)low=mid+1;
        else high=mid;
      }
      return low;
    }
    public int check(int[] bloomDay,int mid,int m,int k){
         int slow=-1,count=0;
         int i=0;
         while(i<bloomDay.length){
              if(bloomDay[i]<=mid){
                  if(i-slow==k){
                      count++;
                      slow=i;
                  }
                  i++;
              }
              else{
                      while(i<bloomDay.length&&bloomDay[i]>mid)
                      i++;
                      slow=i-1;
              }
         }
         return count;
        
    }
}