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1652-拆炸弹(Defuse the Bomb)
发表于:2021-12-03 | 分类: 简单
字数统计: 652 | 阅读时长: 3分钟 | 阅读量:

原文链接: https://leetcode-cn.com/problems/defuse-the-bomb

英文原文

You have a bomb to defuse, and your time is running out! Your informer will provide you with a circular array code of length of n and a key k.

To decrypt the code, you must replace every number. All the numbers are replaced simultaneously.

  • If k > 0, replace the ith number with the sum of the next k numbers.
  • If k < 0, replace the ith number with the sum of the previous k numbers.
  • If k == 0, replace the ith number with 0.

As code is circular, the next element of code[n-1] is code[0], and the previous element of code[0] is code[n-1].

Given the circular array code and an integer key k, return the decrypted code to defuse the bomb!

 

Example 1:

Input: code = [5,7,1,4], k = 3
Output: [12,10,16,13]
Explanation: Each number is replaced by the sum of the next 3 numbers. The decrypted code is [7+1+4, 1+4+5, 4+5+7, 5+7+1]. Notice that the numbers wrap around.

Example 2:

Input: code = [1,2,3,4], k = 0
Output: [0,0,0,0]
Explanation: When k is zero, the numbers are replaced by 0. 

Example 3:

Input: code = [2,4,9,3], k = -2
Output: [12,5,6,13]
Explanation: The decrypted code is [3+9, 2+3, 4+2, 9+4]. Notice that the numbers wrap around again. If k is negative, the sum is of the previous numbers.

 

Constraints:

  • n == code.length
  • 1 <= n <= 100
  • 1 <= code[i] <= 100
  • -(n - 1) <= k <= n - 1

中文题目

你有一个炸弹需要拆除,时间紧迫!你的情报员会给你一个长度为 n 的 循环 数组 code 以及一个密钥 k 。

为了获得正确的密码,你需要替换掉每一个数字。所有数字会 同时 被替换。

  • 如果 k > 0 ,将第 i 个数字用 接下来 k 个数字之和替换。
  • 如果 k < 0 ,将第 i 个数字用 之前 k 个数字之和替换。
  • 如果 k == 0 ,将第 i 个数字用 0 替换。

由于 code 是循环的, code[n-1] 下一个元素是 code[0] ,且 code[0] 前一个元素是 code[n-1] 。

给你 循环 数组 code 和整数密钥 k ,请你返回解密后的结果来拆除炸弹!

 

示例 1:

输入:code = [5,7,1,4], k = 3
输出:[12,10,16,13]
解释:每个数字都被接下来 3 个数字之和替换。解密后的密码为 [7+1+4, 1+4+5, 4+5+7, 5+7+1]。注意到数组是循环连接的。

示例 2:

输入:code = [1,2,3,4], k = 0
输出:[0,0,0,0]
解释:当 k 为 0 时,所有数字都被 0 替换。

示例 3:

输入:code = [2,4,9,3], k = -2
输出:[12,5,6,13]
解释:解密后的密码为 [3+9, 2+3, 4+2, 9+4] 。注意到数组是循环连接的。如果 k 是负数,那么和为 之前 的数字。

 

提示:

  • n == code.length
  • 1 <= n <= 100
  • 1 <= code[i] <= 100
  • -(n - 1) <= k <= n - 1

通过代码

高赞题解

[]
class Solution { public int[] decrypt(int[] code, int k) { int length = code.length; int[] result = new int[length]; if (k == 0) { return result; } else { for (int i = 0; i < length; i++) { int sum = 0; for (int j = 0; j < Math.abs(k); j++) { if (k > 0) { sum += code[(i + j + 1) % length]; } else { sum += code[(i - j - 1 + length) % length]; } } result[i] = sum; } } return result; } }

统计信息

通过次数 提交次数 AC比率
7574 11633 65.1%

提交历史

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