Codeforces(653A)

<span style="font-family: Arial, Helvetica, sans-serif;">#include<iostream></span> using namespace std; int size_balls[55]={0}; int hash_size[1005]={0}; int main() { int n; cin>>n; int bsize; for(int i=1;i<=n;++i){ cin>>bsize; size_balls[i]=bsize; hash_size[bsize]=1; } int cur=0; for(int i=1;i<=n;++i){ cur=size_balls[i]; if((hash_size[cur+1]==1) && (hash_size[cur+2]==1)) { cout<<"YES"<<endl; return 0; } } cout<<"NO"<<endl; return 0; }