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題目鏈接

Run Length Encoding

Time Limit: 1000MS		Memory Limit: 30000K
Total Submissions: 5006		Accepted: 1560

Description

Your task is to write a program that performs a simple form of run-length encoding, as described by the rules below.

Any sequence of between 2 to 9 identical characters is encoded by two characters. The first character is the length of the sequence, represented by one of the characters 2 through 9. The second character is the value of the repeated character. A sequence of more than 9 identical characters is dealt with by first encoding 9 characters, then the remaining ones.

Any sequence of characters that does not contain consecutive repetitions of any characters is represented by a 1 character followed by the sequence of characters, terminated with another 1. If a 1 appears as part of the sequence, it is escaped with a 1, thus two 1 characters are output.

Input

The input consists of letters (both upper- and lower-case), digits, spaces, and punctuation. Every line is terminated with a newline character and no other characters appear in the input.

Output

Each line in the input is encoded separately as described above. The newline at the end of each line is not encoded, but is passed directly to the output.

Sample Input

AAAAAABCCCC
12344

Sample Output

6A1B14C
11123124

題意：找出連續相同的字符有多少個
　　　（1）2<=連續字符長度<=9 輸出個數+字符；>9把9個先輸出，後面的截斷再判斷
　　　（2）沒有相同字符的子序，在第一個和最後一個字符前面輸出1，如果字符是1，就用1轉意，所以1個1就是11；

AC代碼：

#include<cstring>
#include<cstdio>
using namespace std;
const int N=1010;
char s[N];
int main(){
    #ifdef ONLINE_JUDGE
    
 
#else
        freopen("in.txt","r",stdin);
    #endif // ONLINE_JUDGE
    while(gets(s)!=NULL){
        int len=strlen(s);
        int i=0,j;
        while(i<len){
                
            int k=1;
            while(s[i]==s[i+1]&&i<len){
                k++;
                i++;
                if(k>=9) break;
            }
            if(k>1) {
                printf("%d%c",k,s[i-1]);
                i++;
            }
            if(i>=len) break;
            if(s[i]!=s[i+1]){
                printf("1");
                while(s[i]!=s[i+1]&&i<len){
                    if(s[i]==‘1‘) printf("1");
                    printf("%c",s[i]);
                    i++;
                }
                printf("1");
            }
        }
        printf("\n");
    }
    return 0;
}

poj 1782 Run Length Encoding