杭电ACM 1020 Encoding

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Problem Description
Given a string containing only 'A' - 'Z', we could encode it using the following method:

1. Each sub-string containing k same characters should be encoded to "kX" where "X" is the only character in this sub-string.

2. If the length of the sub-string is 1, '1' should be ignored.
 

Input
The first line contains an integer N (1 <= N <= 100) which indicates the number of test cases. The next N lines contain N strings. Each string consists of only 'A' - 'Z' and the length is less than 10000.
 

Output
For each test case, output the encoded string in a line.
 

Sample Input
2ABCABBCCC
 

Sample Output
ABCA2B3C

问题描述与算法分析

题目的意思是当字符串存在多个相同的字符时,在每个字符前加上该字符在字符串中出现的次数。若不存在相同的字符,则只输出字符串。
基本思路:
① 构造一个字符串数组,初始化相同字符的数量num为1,把数组的第一个值str[0]赋值给临时变量temp;
② 从数组的第二个元素查找,若存在与temp值相同的字符,则执行num++,否则转向
③ 若num的值不为1,表明数组存在与str[0]相同的字符,打印出num和temp; 
若num的值为1,表明数组中str[0]对应的字符只有一个,直接打印出temp;
将num值重置为1,temp值赋值为str[i],作为下一次循环的初始条件。

代码如下

#include <iostream>#include <string>using namespace std;int main(){string str;int i,j;int N;cin>>N;while(N--){   cin>>str;int num=1;//用于统计字符个数char t=str[0];//临时变量,用于判断数组是否有相同的字符for(i=1;i<=str.length();i++){if(str[i]==t)    num++;else{if(num!=1){cout<<num<<t;}else{cout<<t;}//num和t重新赋值,作为下一次循环初始条件num=1;t=str[i];}}                     cout<<endl;}return 0;}

测试结果截图



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