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CodeForce 677C - Vanya and Label
阅读量:5264 次
发布时间:2019-06-14

本文共 2136 字,大约阅读时间需要 7 分钟。

Vanya and Label

 

While walking down the street Vanya saw a label "Hide&Seek". Because he is a programmer, he used & as a bitwise AND for these two words represented as a integers in base 64 and got new word. Now Vanya thinks of some string s and wants to know the number of pairs of words of length |s| (length of s), such that their bitwise AND is equal to s. As this number can be large, output it modulo 109 + 7.

To represent the string as a number in numeral system with base 64 Vanya uses the following rules:

  • digits from '0' to '9' correspond to integers from 0 to 9;
  • letters from 'A' to 'Z' correspond to integers from 10 to 35;
  • letters from 'a' to 'z' correspond to integers from 36 to 61;
  • letter '-' correspond to integer 62;
  • letter '_' correspond to integer 63.
Input

The only line of the input contains a single word s (1 ≤ |s| ≤ 100 000), consisting of digits, lowercase and uppercase English letters, characters '-' and '_'.

Output

Print a single integer — the number of possible pairs of words, such that their bitwise AND is equal to string s modulo 109 + 7.

Examples
Input
z
Output
3
Input
V_V
Output
9
Input
Codeforces
Output
130653412
Note

For a detailed definition of bitwise AND we recommend to take a look in the corresponding article in Wikipedia.

In the first sample, there are 3 possible solutions:

  1. z&_ = 61&63 = 61 = z
  2. _&z = 63&61 = 61 = z
  3. z&z = 61&61 = 61 = z

 

题意:

  给出字符串转化为数字,问有多少个 位 & 还是原来的数字

思路:

  把这些字符转化成数字后变成2进制,看有多少个0,如果有n个0,那么就是3的n次方;   因为每一个为0的位置上可以有0&1,1&0,0&0,这3种情况,最后结果就是3的n次方了,快速幂 AC代码:
# include 
using namespace std;const int mod = 1e9+7;string s;int f(char ch){ if(ch >= '0' && ch <= '9') return ch - '0'; else if(ch >= 'A' && ch <= 'Z') return ch-'A'+10; else if(ch >= 'a' && ch <= 'z') return ch - 'a' + 36; else if(ch == '-') return 62; else if(ch == '_') return 63;}int main(){ cin >> s; long long ans = 1; for(int i = 0; i < s.size();i++) { int t = f(s[i]); for(int j = 0; j < 6; j++) if(!((t >> j) & 1 )) ans = ans * 3 % mod; } cout << ans << endl;}
 

 

 

转载于:https://www.cnblogs.com/lyf-acm/p/5786761.html

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