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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <string.h>
  4. #define ll long long
  5. using namespace std;
  6. ll a[100007];
  7. ll b[100007];
  8. bool c[100007];
  9. bool d[100007];
  10. int main()
  11. {
  12.     for(int i=0;i<=100006;i++)
  13.     {
  14.         a[i]=0;
  15.         b[i]=0;
  16.         c[i]=0;
  17.         d[i]=0;
  18.     }
  19.     ll n;
  20.     cin>>n;
  21.     for(int i=0;i<n;i++)
  22.     {
  23.         cin>>a[i];
  24.         b[a[i]]++;
  25.     }
  26.     ll temp=0;
  27.     for(int i=1;i<=100002;i+=2)
  28.     {
  29.         temp += (b[i]*i);
  30.         c[i]=1;
  31.     }
  32.     for(int i=2;i<=100002;i+=2)
  33.     {
  34.         if(b[i]*i > (b[i-1]*(i-1) + b[i+1]*(i+1)))
  35.         {
  36.             temp += (b[i]*i);
  37.             if(c[i-1]==1)
  38.             {
  39.                 temp -= (b[i-1]*(i-1));
  40.                 c[i-1]=0;
  41.             }
  42.             if(c[i+1]==1)
  43.             {
  44.                 c[i+1]=0;
  45.                 temp -= (b[i+1]*(i+1));
  46.             }
  47.  
  48.         }
  49.     }
  50.  
  51.  
  52.  
  53.  
  54.  
  55.     ll temp2=0;
  56.  
  57.     for(int i=2;i<=100002;i+=2)
  58.     {
  59.         temp2 += (b[i]*i);
  60.         d[i]=1;
  61.     }
  62.     for(int i=1;i<=100002;i+=2)
  63.     {
  64.         if(b[i]*i > (b[i-1]*(i-1) + b[i+1]*(i+1)))
  65.         {
  66.             temp2 += (b[i]*i);
  67.             if(d[i-1]==1)
  68.             {
  69.                 temp2 -= (b[i-1]*(i-1));
  70.                 d[i-1]=0;
  71.             }
  72.             if(d[i+1]==1)
  73.             {
  74.                 d[i+1]=0;
  75.                 temp2 -= (b[i+1]*(i+1));
  76.             }
  77.         }
  78.     }
  79.  
  80.     cout<<((temp>temp2)?temp:temp2);
  81.  
  82. }
Success #stdin #stdout 0s 5056KB
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https://ideone.com/MVT6SI
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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