problem0639

package
Version: v0.0.0-...-db5e768 Latest Latest
Warning

This package is not in the latest version of its module.

Go to latest
Published: Jul 25, 2019 License: MIT Imports: 0 Imported by: 0

README

639. Decode Ways II

题目

A message containing letters from A-Z is being encoded to numbers using the following mapping way:

'A' -> 1
'B' -> 2
...
'Z' -> 26

Beyond that, now the encoded string can also contain the character '*', which can be treated as one of the numbers from 1 to 9.

Given the encoded message containing digits and the character '*', return the total number of ways to decode it.

Also, since the answer may be very large, you should return the output mod 10^9 + 7.

Example 1:
Input: "*"
Output: 9
Explanation: The encoded message can be decoded to the string: "A", "B", "C", "D", "E", "F", "G", "H", "I".

Example 2:
Input: "1*"
Output: 9 + 9 = 18

Note:

  1. The length of the input string will fit in range [1, 105].
  2. The input string will only contain the character '*' and digits '0' - '9'.

解题思路

见程序注释

Documentation

Index

Constants

View Source
const MOD = 1000000007

MOD 题目要求,返回的结果需要对 MOD 取余

Variables

This section is empty.

Functions

This section is empty.

Types

This section is empty.

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
t or T : Toggle theme light dark auto
y or Y : Canonical URL