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1041 Be Unique
阅读量:733 次
发布时间:2019-03-21

本文共 1405 字,大约阅读时间需要 4 分钟。

The task at hand is to determine the winning number in a unique lottery system designed for Martian inhabitants. The game works by participants betting on numbers from a specific range, and the winner is the first to bet on a unique number not previously chosen.

Input and Output

Each test case consists of a line starting with an integer N (≤ 10^5), followed by N bets. These bets are separated by spaces. The output should be the winning number only if there is one. If no unique number exists after all bets, return "None".

Example 1

Input:

7 5 31 5 88 67 88 17
The program processes each bet, keeping track of each number. The first unique number is "31", so it is printed.

Output:

31

Example 2

Input:

5 888 666 666 888 888
In this case, the bets go 5 times. The program counts occurrences: 888 appears 3 times, 666 appears 2 times, and both have duplicates. Thus, no unique winner exists, and the output is "None".

Technology in Action

The provided C++ implementation uses an efficient array-based approach to track bets:

  • Read the number of bets and store each in an array.
  • Maintain a frequency array to count occurrences.
  • After processing all bets, iterate through the frequency array to find the first count that equals 1.
  • Output this number or "None" if no unique number exists.
  • This approach ensures that the solution is both simple and efficient, handling up to the maximum constraints smoothly.

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