BOJ 16634 - Run-Length Encoding, Run! [C++]

문제

링크

풀이

#include <iostream>
#include <string>
using namespace std;
 
void encode(const string &s) {
  char cur = s[0]; int cnt = 1;
  for (int i=1; i<s.length(); i++) {
    if (s[i] == cur) cnt++;
    else {
      cout << cur << cnt;
      cur = s[i]; cnt = 1;
    }
  }
  if (cnt) cout << cur << cnt;
}
 
void decode(const string &s) {
  for (int i=0; i<s.length(); i+=2) {
    for (int j=0; j<s[i+1]-'0'; j++) cout << s[i];
  }
}
 
void solve(void) {
  char c; string s; cin >> c >> s;
 
  (c == 'E' ? encode : decode)(s);
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}