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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5.  
  6. vector<string>num; //mang xau
  7. vector<string>num2;
  8.  
  9. bool isNumber (string s)
  10. {
  11. 	for (int i = 0; i < s.size(); i++)
  12. 	{
  13. 		if (isdigit(s[i]) == false) return false;
  14. 	}
  15. 	return true;
  16. }
  17.  
  18. bool isDigit(char s)
  19. {
  20. 	if (s >= '0' && s <= '9') return true;
  21. 	else return false;
  22. }
  23.  
  24. string Erase_Useless_Zero(string s)
  25. {
  26. 	while (s[0] == '0') s.erase(0,1);
  27. 	return s;
  28. }
  29.  
  30. string maximize(string a, string b)
  31. {
  32. 	if (a[0] == '-' && b[0] != '-') return b;
  33. 	if (a[0] != '-' && b[0] == '-') return a;
  34. 	if (a[0] == '-' && b[0] == '-') return min(a,b);
  35. 	if (a[0] == '-' && b[0] == '0') return b; //neu co 0
  36. 	if (a[0] == '0' && b[0] == '-') return a; //neu co 0
  37. 	if (a.size() < b.size()) return b;
  38. 	if (a.size() > b.size()) return a;
  39. 	return max(a,b);
  40. }
  41.  
  42. signed main()
  43. {
  44.   ios_base::sync_with_stdio(0);
  45.   cin.tie(0);
  46.   cout.tie(0);
  47.   string s;
  48.   getline(cin, s);
  49.   if (isNumber(s) == true)
  50.   {
  51.   	s = Erase_Useless_Zero(s);
  52.   	cout << s;
  53.   	return 0;
  54.   }
  55.   string ans = "0";
  56.   string res = "";
  57.   for (int i = 0; i < s.size(); i++)
  58.   {
  59.   	if (isDigit(s[i]) == true || s[i] == '-')
  60.   	{
  61.   		if (res == "" && s[i] == '0') continue;
  62.   		else res.push_back(s[i]);
  63. 	}
  64. 	else
  65. 	{
  66. 		if (res != "")
  67. 		{
  68. 			ans = maximize(res, ans);
  69. 			res = "";
  70. 		}
  71. 	}
  72.   }
  73.   ans = maximize(ans,res);
  74.   cout << ans;
  75.   return 0;
  76. }
  77.  
Success #stdin #stdout 0s 5412KB
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stdin
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Abc987hnmh0003456hs006543m
stdout
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6543
https://ideone.com/OK7PM1
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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