zoukankan      html  css  js  c++  java
  • Leetcode-299 Bulls and Cows

    #299. Bulls and Cows     

    You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is. Each time your friend makes a guess, you provide a hint that indicates how many digits in said guess match your secret number exactly in both digit and position (called "bulls") and how many digits match the secret number but locate in the wrong position (called "cows"). Your friend will use successive guesses and hints to eventually derive the secret number.

    For example:

    Secret number:  "1807"
    Friend's guess: "7810"
    

    Hint: 1 bull and 3 cows. (The bull is 8, the cows are 0, 1 and 7.)

    Write a function to return a hint according to the secret number and friend's guess, use A to indicate the bulls and B to indicate the cows. In the above example, your function should return "1A3B".

    Please note that both secret number and friend's guess may contain duplicate digits, for example:

    Secret number:  "1123"
    Friend's guess: "0111"
    

    In this case, the 1st 1 in friend's guess is a bull, the 2nd or 3rd 1 is a cow, and your function should return "1A1B".

    You may assume that the secret number and your friend's guess only contain digits, and their lengths are always equal.

    class Solution {
    public:
        string getHint(string secret, string guess) {
             int ret_a=0;
             int ret_b=0;
             int len=secret.size();
             int a1[10]={0};
             int a2[10]={0};
             for(int i=0;i<len;i++)
             {
                 if(secret[i]==guess[i])
                 ret_a++;
             }
             for(int i=0;i<len;i++)
             {
                 a1[secret[i]-'0']++;
                 a2[guess[i]-'0']++;
             }
             for(int i=0;i<10;i++)
             {
                 ret_b+=min(a1[i],a2[i]);
             }
             ret_b-=ret_a;
             return to_string(ret_a)+'A'+to_string(ret_b)+'B';
             
        }
        
    };

        

  • 相关阅读:
    前端接口设计
    前端协作流程
    编写jQuery插件
    jQuery插件之validation插件
    深入理解ajax系列第九篇——jQuery中的ajax
    前端学PHP之Smarty模板引擎
    第3选择-解决所有难题的关键思维,种下好的种子避免落入钻石交易
    阿里BCG重磅报告《人工智能,未来致胜之道》
    关于web开发前端h5框架的选择
    html5+php实现文件的断点续传ajax异步上传
  • 原文地址:https://www.cnblogs.com/fengxw/p/6195126.html
Copyright © 2011-2022 走看看