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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define ll long long
  5. #define endl "\n"
  6. #define FOR(i, a, b) for (int i = a; i <= b; i++)
  7. #define FORD(i, a, b) for (int i = a; i > b; i--)
  8. #define FORu(i, a, b) for (int i = a; i < b; i++)
  9. #define vii vector <int> 
  10. #define pb push_back
  11. #define fi first
  12. #define se second
  13. #define sz(a) (int)a.size()
  14. #define all(x) x.begin(), x.end()
  15. #define filei "BAI4.INP"
  16. #define fileo "BAI4.out"
  17. int main()
  18. {
  19.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  20.     if (fopen(filei, "r"))
  21.     {
  22.         freopen(filei, "r", stdin);
  23.         freopen(fileo, "w", stdout);
  24.     }
  25.     int n, k; string s;
  26.     cin >> n >> k >> s;
  27.     stack < pair <char, int> > st;
  28.     FORu(i, 0, sz(s))
  29.     {
  30.     	if (st.empty()) st.push({s[i], 1});
  31.     	else
  32.     	{
  33.     		if (st.top().fi == s[i])
  34.     		{
  35.     			++st.top().se;
  36.     			if (st.top().se == k) st.pop();
  37.     		}
  38.     	}
  39.     }
  40.     string c = "";
  41.     while (!st.empty())
  42.     {
  43.     	c = string(st.top().se, st.top().fi) + c;
  44.     	st.pop();
  45.     }
  46.     cout << c;
  47.  
  48.  
  49. }
Success #stdin #stdout 0.01s 5304KB
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stdin
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9 3
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stdout
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Standard output is empty
https://ideone.com/dRW7YT
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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