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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define faster ios_base::sync_with_stdio(false) ; cin.tie(NULL)
  4.  
  5. string s;
  6.  
  7. void inp(){
  8.     cin >> s;
  9. }
  10.  
  11. string Max(string &s1 , string &s2){
  12.     if (s1.size() < s2.size()) return s2;
  13.     if (s1.size() > s2.size()) return s1;
  14.     if (s1 >= s2) return s1;
  15.     return s2;
  16. }
  17.  
  18. void solve(){
  19.     string res = "";
  20.     int i = 0;
  21.     while (i < s.size()){
  22.         if (!isdigit(s[i]) || s[i] == '0'){
  23.             ++i;
  24.             continue;
  25.         }
  26.         string x;
  27.         x += s[i];
  28.         while (i < s.size() - 1 && isdigit(s[i + 1])){
  29.             ++i;
  30.             x += s[i];
  31.         }
  32.         res = Max(res , x);
  33.         ++i;
  34.     }
  35.     if (res.size() == 0) cout << -1;
  36.     else cout << res;
  37. }
  38.  
  39. int main(){
  40.     faster;
  41.     inp();
  42.     solve();
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 5304KB
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stdin
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Standard input is empty
stdout
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-1
https://ideone.com/ql2Ld6
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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