leetcode209 长度最小的子数组
作者:互联网
方法一:暴力,两层for循环——会超时
Python
class Solution:
def minSubArrayLen(self, target: int, nums: List[int]) -> int:
result = len(nums) + 1
for i in range(len(nums)):
temp = 0
for j in range(i, len(nums)):
temp += nums[j]
if temp < target:
continue
else:
result = min(result, j - i + 1)
break
if result == len(nums) + 1:
return 0
return result
Java
class Solution {
public int minSubArrayLen(int target, int[] nums) {
int result = nums.length + 1;
for (int i = 0; i < nums.length; i++) {
int temp = 0;
for (int j = i; j < nums.length; j++) {
temp += nums[j];
if (temp < target) {
continue;
} else {
result = Math.min(result, j - i + 1);
break;
}
}
}
if (result == nums.length + 1) {
return 0;
} else {
return result;
}
}
}
方法二:滑动窗口
窗口端点的移动方式:
- 若窗口内数值的和大于等于目标值,窗口左端移动,此时可以更新窗口大小最小值
- 若窗口内数值的和小于目标值,窗口右端移动
Python
class Solution:
def minSubArrayLen(self, target: int, nums: List[int]) -> int:
left = 0
right = 0
result = len(nums) + 1
sum_temp = nums[0]
while left < len(nums) or right < len(nums):
if sum_temp >= target:
result = min(result, right -left + 1)
sum_temp -= nums[left]
left += 1
else:
right += 1
if right == len(nums):
break
sum_temp += nums[right]
if result == 1:
return result
if result == len(nums) + 1:
return 0
return result
Java
class Solution {
public int minSubArrayLen(int target, int[] nums) {
int left = 0;
int right = 0;
int result = nums.length + 1;
int sum_temp = nums[0];
while (left < nums.length || right < nums.length) {
if (sum_temp >= target) {
result = Math.min(result, right - left + 1);
sum_temp -= nums[left];
left++;
}else {
right ++;
if (right == nums.length) {
break;
}
sum_temp += nums[right];
}
if (result == 1) {
return 1;
}
}
if (result == nums.length + 1) {
return 0;
}
return result;
}
}
标签:right,return,temp,nums,int,result,数组,leetcode209,长度 来源: https://www.cnblogs.com/waitting975/p/16398680.html