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:
    How To Move a MySQL Data Directory to a New Location on Ubuntu 16.04
    Mysql Docker Container Command
    svg_png
    png格式图片转为svg格式图片
    Ubuntu Server如何配置SFTP(建立用户监狱)
    ubuntu用户添加adduser, useradd并给予sudo权限
    Setup FTP server on Ubuntu 14.04
    Ubuntu Server 16.04.1系统安装
    1.Linux下生成密钥
    Linux查看设备命令
  • 原文地址:https://www.cnblogs.com/fengxw/p/6195126.html
Copyright © 2011-2022 走看看