LeetCode 560. Subarray Sum Equals K

阿新 • • 發佈：2018-12-12

題解

看到連續子序列和，必然想到字首和。但是光有字首和這題還做不了，如何使得和為目標數目呢？此題和前面做過的一道4SUM有點像，關鍵還是用map來儲存便於查詢。設想 map[ sum ] 表示字首和為sum的數量，那麼當我們累計算得當前位置的和為sum時，我們考察 map[ sum - k ] 的數量，這就是一份使得目標數k 成立的答案。看程式碼，很巧。

Code

class Solution {
public:
    int subarraySum(vector<int>& nums, int k) {
        int n = nums.size() 
;
        unordered_map<int,int> m;
        int sum=0,ans=0;
        m[0]=1;
        for(int i=0;i<n;i++){
            sum+=nums[i];
            if( m.count(sum-k))// sum - (sum-k) = k | 此時的sum-k恰好是在此位之前的 數量
                ans+=m[sum-k];
            m[sum]++;
        }
        return ans; 
    } 

};

LeetCode 560. Subarray Sum Equals K （子數組之和等於K）

它的 ash tar spa logs his map 可能解法 Given an array of integers and an integer k, you need to find the total number of continuous subarrays

LeetCode 560. Subarray Sum Equals K

題解看到連續子序列和，必然想到字首和。但是光有字首和這題還做不了，如何使得和為目標數目呢？此題和前面做過的一道4SUM有點像，關鍵還是用map來儲存便於查詢。設想 map[ sum ] 表示字首和

LeetCode 560. Subarray Sum Equals K (和為K的子陣列)

原題 Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1:

LeetCode---560. Subarray Sum Equals K

題目給出一個整數陣列和目標值，你需要找到所有的連續子序列，該子序列的和為目標值。輸出滿足該條件的子序列的個數。 Python題解 class Solution: def subarr

[leetcode] 560. Subarray Sum Equals K

Given an array of integers and an integer k, you need to find the total number of continuous subarr

[leetcode]Map-560. Subarray Sum Equals K

not who nbsp bar pan put pre ret color Given an array of integers and an integer k, you need to find the total number of continuous sub

560. Subarray Sum Equals K

let find numbers nothing complex optimize ref equals map Problem statement: Given an array of integers and an integer k, you need to fin

Map-560. Subarray Sum Equals K

ger emp span post [] tput spa number total Given an array of integers and an integer k, you need to find the total number of continuous s

560.Subarray Sum Equals K

hose color padding amp arr spa 循環 who output Description Given an array of integers and an integer k, you need to find the total number o

560. Subarray Sum Equals K - Medium

Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:

LeetCode 560. 和為K的子數組（Subarray Sum Equals K）

子數組和 tor 之前 -s 一個 leetcode 更新 spa int 題目描述給定一個整數數組和一個整數 k，你需要找到該數組中和為 k 的連續的子數組的個數。示例 1 : 輸入:nums = [1,1,1], k = 2 輸出: 2 , [1,1]

LeetCode-Subarray Sum Equals K

一、Description Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to

LeetCode - Subarray sum equals k

Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:

Leetcode: Subarray Sum Equals K\\\Binary Subarrays With Sum

Problem Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to

[LeetCode] Maximum Size Subarray Sum Equals k 最大子陣列之和為k

Given an array nums and a target value k, find the maximum length of a subarray that sums to k. If there isn't one, return 0 instead. Example 1: G

[LeetCode] Subarray Sum Equals K 子陣列和為K

Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:nums = [

325. Maximum Size Subarray Sum Equals k

ret 快速 arr guarantee 快速查找 you def targe bject Given an array nums and a target value k, find the maximum length of a subarray that sums t

算法(10)Subarray Sum Equals K

超時 namespace 公司 mes style als += fas 架構題目：在數組中找到一個子數組，讓子數組的和是k。思路：先發發牢騷，這兩天做題是卡到不行哇，前一個題折騰了三天，這個題上午又被卡住，一氣之下，中午睡覺，下午去了趟公司，竟然把namespace和

325 Maximum Size Subarray Sum Equals k

use als span val number array tco lint size Given an array nums and a target value k, find the maximum length of a subarray that sums to

325. Maximum Size Subarray Sum Equals k 和等於k的最長子數組

length ++ can solution image with number OS bug ［抄題］： Given an array nums and a target value k, find the maximum length of a subarray tha

LeetCode 560. Subarray Sum Equals K

題解

Code

相關推薦