# how to sum numbers

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### Project Euler 88:product-sumnumbers product and sum

Product-sum numbersA natural number, N, that can is written as the sum and product of a given set of at least the natural numbers, {a1, A2, ... , AK} is called a product-sum number:n = a1 + A2 + ... + ak = A1xa2x...xak.For example, 6 = 1 + 2 + 3 =

### Quickly find two numbers in an array so that the sum of the two numbers equals a given value

I think the writing is very clear, I hope there is no infringement of the author's copyright, the original address http://blog.csdn.net/hackbuteer1/article/details/6699642To quickly find the two numbers in an array so that the sum of the two numbers

### For an interview, the sum of two numbers is a certain number, and the number of consecutive numbers is equal to a certain number.

For an interview, the sum of two numbers is a certain number, and the number of consecutive numbers is equal to a certain number. 　　Question 1EnterIncrementSort the array and number s, and find two numbers in the array so that their sum is exactly s.

### Lintcode Medium title: 4 Sum of four numbers

TopicFour sum of the numbersTo an array of integers containing n, find all the four tuples (a, B, C, D) that make and are the target of the given integer in S.Sample ExampleFor example, for a given array of integers s=[1, 0,-1, 0,-2, 2] and target=0

### Lintcode Medium Title: 3 Sum II three numbers and II

TopicThree sum of the numbers IIto an array containing n integers, find and the ternary group closest to the given integer target, returning the number of the three numbers.Sample ExampleFor example s = [-1, 2, 1,-4] and target = 1. And the ternary

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### [Sword refers to offer learning] the sum is the two numbers of a specified value, and the sword refers to offer.

[Sword refers to offer learning] the sum is the two numbers of a specified value, and the sword refers to offer. In the legend of the Condor Heroes, there are three swords used in the life of the 'swordsman dedicated to defeat: 'Yang once

### (Hdu step 4.3.3) Sum It Up (select m numbers from n numbers for them to reach the specified and targetSum, and output all valid sequences), hdutargetsum

(Hdu step 4.3.3) Sum It Up (select m numbers from n numbers for them to reach the specified and targetSum, and output all valid sequences), hdutargetsum Question: Sum It Up Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536

### Leetcode 560. Subarray Sum equals K (the sum of the sub-arrays equals K)

Given an array of integers and a integer k, you need to find the total number of continuous subarrays whose sum equals to K.Example 1:Input:nums = [1,1,1], k = 2output:2Note: The length of the array is in range [1, 20,000]. The range of

### (Hdu step 1.2.8) Specialized Four-Digit Numbers (calculate the sum of Numbers on each Digit), hdu1.2.8

(Hdu step 1.2.8) Specialized Four-Digit Numbers (calculate the sum of Numbers on each Digit), hdu1.2.8 Question: Specialized Four-Digit Numbers Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)

### Decomposition of positive integers into the sum of several contiguous natural numbers

Title: Enter a positive integer that outputs all possible positive integer sequences if the number can be represented by a sum of several consecutive positive integers.A positive integer may be represented as a sum of N (n>=2) consecutive positive

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