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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define sd(x) scanf("%d", &x)
  4. #define slld(x) scanf("%lld", &x)
  5. #define all(x) x.begin(), x.end()
  6. #define For(i, st, en) for(ll i=st; i<en; i++)
  7. #define tr(x) for(auto it=x.begin(); it!=x.end(); it++)
  8. #define fast std::ios::sync_with_stdio(false);cin.tie(NULL);
  9. #define pb push_back
  10. #define ll long long
  11. #define int long long
  12. #define mp make_pair
  13. #define F first
  14. #define S second
  15. typedef pair<int, int> pii;
  16. #define MOD 1000000007
  17. #define INF 1000000000000000007
  18. #define MAXN 300005
  19.  
  20. // it's swapnil07 ;)
  21.  
  22. signed main(){
  23.     fast
  24.     #ifdef SWAPNIL07
  25.         freopen("input.txt","r",stdin);
  26.         freopen("output.txt","w",stdout);
  27.     #endif
  28.     string s; cin>>s; 
  29.     int n = s.length();
  30.     bool flag = false;
  31.     set<int> ones;
  32.     For(i, 0, n){
  33.         if(s[i]=='1'){
  34.             ones.insert(i);
  35.         }
  36.         else{
  37.             if(ones.size()){
  38.                 ones.erase(*ones.rbegin());
  39.             }
  40.         }
  41.     }
  42.  
  43.     For(i, 0, n){
  44.         if(ones.find(i)!=ones.end()){
  45.             cout<<0;
  46.         }
  47.         else{
  48.             cout<<s[i];
  49.         }
  50.     }
  51.     return 0;
  52. }
Success #stdin #stdout 0s 4500KB
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https://ideone.com/DR9whf
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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