There are 5 ways to assign symbols to make the sum of nums be target 3. Note: The length of the given array is positive and will not exceed 20. The sum of elements in the given array will not exceed 1000. Your output answer is guaranteed to be fitted in a 32-bit integer. 题目大...
Python代码实现 python def two_sum(nums, target): # 初始化一个空字典用于存储数字及其索引 num_dict = {} # 遍历整数列表 for index, num in enumerate(nums): # 计算目标值与当前数字的差值 diff = target - num # 检查差值是否已经在字典中存在 if diff in num_dict: # 如果存在,返回差值的索引和...
Python完整代码如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #-*-coding:utf-8-*-defmax(a,b):returnaifa>belsebdefminimum_operations(nums,target):n=len(nums)ans=max(target[0]-nums[0],0)foriinrange(1,n):ans+=max((target[i]-nums[i])-(target[i-1]-nums[i-1]),0)ans...
class Solution(object): def twoSum(self, nums, target): if len(nums) < 2: return for i in range(0, len(nums) - 1): for j in range(i + 1, len(nums)): if nums[i] + nums[j] == target: return [i, j] nums = [2, 7, 11, 15] s = Solution() 第二种解法: def solu...
cost=np.sum(error**2)/(2*m)returncost# 初始化参数theta=np.random.randn(2,1)# 使用梯度下降法优化目标函数defgradient_descent(X,y,theta,learning_rate=0.01,num_iterations=1000):m=len(y)for_inrange(num_iterations):y_pred=X.dot(theta)error=y_pred-y ...
Given an array S of n integers, find three integers in S such that the sum is closest to a given number: target. Return the sum of the three integers. You may assume that each input would have exactly one solution. example 1
【python-双指针】pair with target sum 找不到该题对应leetcode的哪一题。。。 问题描述: 给定一个有序数组和一个目标和,在数组中找到一对和等于给定目标的数组,有就返回下标,没有就返回[-1,-1]。 例如: s=[1,2,3,4,5,6,7,8],k=14,返回[5,7],也就是下标为5和下标为7的和为14:6+8=14...
""" 作者:上海-悠悠 python QQ交流群:730246532 联系微信/QQ: 283340479 """deftarget_function(a, b, target): target_map = []# 收集结果,一个队列foriina:forjinb:ifi+j <= target:iflen(target_map) ==0:# 如果队列为空,直接入栈target_map.append((i, j))else:ifi+j ==sum(target_map[-...
(pred)).sum().item()test_loss/=len(test_loader.dataset)accuracy=100.0*correct/len(test_loader.dataset)returntest_loss,accuracy # 主训练循环forepochinrange(10):# 假设训练10个epochtrain(model,train_loader,criterion,optimizer)test_loss,accuracy=test(model,test_loader,criterion)print('Epoch: {},...
方法二:使用哈希表,通过以空间换取速度的方式,我们可以将查找时间从 O(n)降低到 O(1)。在python中列表字典的即为哈希类型。 class Solution(object): def twoSum(self, nums, target): """ :type nums: List[int] :type target: int :rtype: List[int] ...