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| 10008 | |
| What’s Cryptanalysis? | |
| Cryptanalysis is the process of breaking someone else’s cryptographic writing. This sometimes involves | |
| some kind of statistical analysis of a passage of (encrypted) text. Your task is to write a program which | |
| performs a simple analysis of a given text. | |
| Input | |
| The first line of input contains a single positive decimal integer n. This is the number of lines which | |
| follow in the input. The next n lines will contain zero or more characters (possibly including whitespace). | |
| This is the text which must be analyzed. | |
| Output | |
| Each line of output contains a single uppercase letter, followed by a single space, then followed by a | |
| positive decimal integer. The integer indicates how many times the corresponding letter appears in the | |
| input text. Upper and lower case letters in the input are to be considered the same. No other characters | |
| must be counted. The output must be sorted in descending count order; that is, the most frequent | |
| letter is on the first output line, and the last line of output indicates the least frequent letter. If two | |
| letters have the same frequency, then the letter which comes first in the alphabet must appear first in | |
| the output. If a letter does not appear in the text, then that letter must not appear in the output. | |
| Sample Input | |
| 3 | |
| This is a test. | |
| Count me 1 2 3 4 5. | |
| Wow!!!! | |
| Is this question easy? | |
| Sample Output | |
| S 7 | |
| T 6 | |
| I 5 | |
| E 4 | |
| O 3 | |
| A 2 | |
| H 2 | |
| N 2 | |
| U 2 | |
| W 2 | |
| C 1 | |
| M 1 | |
| Q 1 | |
| Y 1 |