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  1. #include <iostream>
  2. #include <vector>
  3.  
  4.  
  5. using namespace std ;
  6. int main(){
  7.     int n ,a,sum = 0;
  8.  
  9.  
  10.  
  11.     vector <int> seq ;
  12.     cin >> n;
  13.     for(int i = 0 ;i< n ;i++){
  14.         cin >> a;
  15.         seq.push_back(a);
  16.     }
  17.  
  18.     for (int i = 0; i<n-2 ;i++){//原本是寫(int i = 0 ; i< seq.size()-2;i++)
  19.         if((seq[i+1]<seq[i]&&seq[i+1]<seq[i+2])||(seq[i+1]>seq[i]&&seq[i+1]>seq[i+2])) sum ++ ;
  20.  
  21.     }
  22.  
  23.     cout << sum ;
  24.     return 0 ;
  25. }
  26.  
Success #stdin #stdout 4.16s 16064KB
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https://ideone.com/jrAIvY
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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