问题描述： 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

Input The first input line contains an integer n (1 ≤ n ≤ 10) which represents the number of already made guesses. Then follow n lines in the form of “ai bi ci”, where ai is the i-th experimental numb

题目： You are playing the following Bulls and Cows game with your friend: You write a 4-digit secret number and ask your friend to guess it. Each time your friend guesses a number, you give a hint.

题目： 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 hin

题目 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

这道题感觉也真是给自己新知，自己一开始有点蒙，尤其是想就一次循环把两只牛都求出来。一次求其实可以，但确实一上来有难度，这个在平时也就罢了，但在面试时咋办啊。退而求其次，就一点，找到一个能work的方法也行。 下面的做法是参考了一种两次循环的比较好的。 第一次for，求出bull的数量，同时将secret的其它字符连带数量存入map， 第二次for，求出cow的数量，比对guess 这种妥协