1140 Look-and-say Sequence

#include <iostream>

using namespace std;

int main() {

string s;

int n, j;

cin >> s >> n;

for (int cnt = 1; cnt < n; cnt++) {

string t;

for (int i = 0; i < s.length(); i = j) {

for (j = i; j < s.length() && s[j] == s[i]; j++);

t += s[i] + to_string(j - i);

}

s = t;

}

cout << s;

return 0;

}