技術標籤：PAT甲

link

#include<iostream>
#include<string>
using namespace std;
int main() {
	string s;
	int n;
	cin >> s >> n;
	while (--n) {
		string tmp;
		int i, j;//2個指標
		//1121
		for (i = 0; i < s.length(); i = j) {
			//i=0
			//i=2
			//i=3
			for (j = i; j < s.length() &&
 
 s[i] == s[j]; j++);
				//i=j=0
				//s[0]=s[0]、s[0]=s[1]//i=0,j=2//j-i=2//s[i]=1

				//i=j=2
				//s[2]=s[2]//i=2,j=3//j-i=1//s[i]=2

				//i=j=3
				//s[3]=s[3]//i=3,j=4//j-i=1//s[i]=1
				tmp += s[i];
				tmp += j - i + '0';
		}
		s = tmp;//122111
	}
	cout << s;
	return 0;
}