[leetcode]91. Decode Ways
2017-07-29 21:07
288 查看
题目链接：https://leetcode.com/problems/decode-ways/description/
A message containing letters from
mapping:
Given an encoded message containing digits, determine the total number of ways to decode it.
For example,
Given encoded message
2) or
The number of ways decoding
A message containing letters from
A-Zis being encoded to numbers using the following
mapping:
'A' -> 1 'B' -> 2 ... 'Z' -> 26
Given an encoded message containing digits, determine the total number of ways to decode it.
For example,
Given encoded message
"12", it could be decoded as
"AB"(1
2) or
"L"(12).
The number of ways decoding
"12"is 2.
class Solution {
public:
int numDecodings(string s) {
if(s.empty()) return 0;
vector<int> res(s.size()+1,0);
res[0]=1;
for(int i=1;i<s.size()+1;i++)
{
if(s[i-1]>='1' && s[i-1]<='9')
res[i]+=res[i-1];
if(i-2>=0 && s.substr(i-2,2)<="26" && s.substr(i-2,2)>="10")
res[i]+=res[i-2];
}
return res[s.size()];
}
};
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- leetcode 91. Decode Ways
- leetcode 91. Decode Ways
- Leetcode——91. Decode Ways
- [leetcode] 91. Decode Ways 解题报告
- LeetCode-91. Decode Ways
- [leetcode] 91. Decode Ways
- [leetcode] 91. Decode Ways
- leetcode 91. Decode Ways
- 【Leetcode】91. Decode Ways
- 【LeetCode】91. Decode Ways
- [leetcode]91. Decode Ways
- leetcode 91. Decode Ways
- LeetCode 91. Decode Ways
- Leetcode 91. Decode Ways
- LeetCode 91. Decode Ways
- (Java) LeetCode 91. Decode Ways —— 解码方法
- LeetCode 91. Decode Ways（解码方法）
- [LeetCode] 91. Decode Ways
- [leetcode]91. Decode Ways(Java)
- Leetcode 91. Decode Ways (Medium) (cpp)