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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  void fastscan(int &x)
  4.     {
  5.         bool neg=false;
  6.         register int c;
  7.         x =0;
  8.         c=getchar();
  9.         if(c=='-')
  10.         {
  11.             neg = true;
  12.             c=getchar();
  13.         }
  14.         for(;(c>47 && c<58);c=getchar())
  15.             x = (x<<1) + (x<<3) +c -48;
  16.         if(neg)
  17.             x *=-1;
  18.     }
  19.  
  20. int main()
  21. {
  22. int a,b,c,d,e,f,g,h;
  23. fastscan(a);
  24. map <int,int> my;
  25. for(b=0;b<a;b++)
  26. {
  27.     fastscan(g);
  28. my[g]++;
  29.  
  30. }
  31. map <int,int> :: iterator it;
  32. for(it=my.begin();it!=my.end();it++)
  33. {
  34.     if(it->second == 1)
  35.     {
  36.         printf("%d\n",it->first);
  37.         break;
  38.     }
  39. }}
  40.  
Success #stdin #stdout 0s 15240KB
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https://ideone.com/FDClmr
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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