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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5.  
  6. void solve(){
  7.     int n;
  8.     cin>>n;
  9.     vector<int>v(n);
  10.     for(int i=0;i<n;i++)cin>>v[i];
  11.  
  12.     vector<int>pref(n,0);
  13.     for(int j=0;j<n;j++){
  14.         for(int i=0;i<j;i++){
  15.             if(v[i]+1==v[j])pref[j]++;
  16.         }
  17.     }
  18.  
  19.     vector<int>suf(n,0);
  20.     for(int j=n-1;j>=0;j--){
  21.         for(int k=j+1;k<n;k++){
  22.             if(v[j]+1==v[k])suf[j]++;
  23.         }
  24.     }
  25.  
  26.     for(int i=1;i<n-1;i++){
  27.         if(pref[i]>=1&&suf[i]>=1){
  28.             cout<<"True\n";
  29.             return;
  30.         }
  31.     }
  32.     cout<<"False\n";
  33. }
  34.  
  35. int main(){
  36.     ios_base::sync_with_stdio(false);
  37.     cin.tie(NULL);
  38.     solve();
  39.     return 0;
  40. }
Success #stdin #stdout 1.03s 5288KB
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stdin
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Standard input is empty
stdout
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False
https://ideone.com/EL7OpD
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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