1639. Run Length Encoding

坑爹啊有Null 字元串的情況，PE了好多次。

#include <iostream>#include <string>#include <cctype>using namespace std;int main(){string s;while(getline(cin,s)){if(s==""){cout<<endl;continue;}int count=0,len=s.length();bool b=true;for(int i=0;i<len;i++){if(isdigit(s[i])){if(i+1<len&&isdigit(s[i+1])){if(i+2<len&&isdigit(s[i+2])){b=false;break;}else{count+=(s[i]-'0')*10+s[i+1]-'0';i+=2;}}else{count+=s[i]-'0';i++;}}else count++;}if(count>50) b=false;if(b==false){cout<<"TOO LONG"<<endl;continue;}for(int i=0;i<len;i++){if(isdigit(s[i])){if(i+1<len&&isdigit(s[i+1])){for(int j=0;j<(s[i]-'0')*10+s[i+1]-'0';j++)cout<<s[i+2];i+=2;}else {for(int j=0;j<s[i]-'0';j++)cout<<s[i+1];i++;}}else cout<<s[i];}cout<<endl;}return 0;}