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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() 
  5. {
  6.     while(1)
  7.     {
  8.         int n,i,k=1;
  9.         cin>>n;
  10.         if(n==0)
  11.         {
  12.             break;
  13.         }
  14.         stack <int> st;
  15.         int p[1000];
  16.         for(i=0;i<n;i++)
  17.         {
  18.             cin>>p[i];
  19.         }
  20.         i=0;
  21.         while(i<n)
  22.         {
  23.             if(p[i]==k)
  24.             {
  25.                 k++;
  26.             }
  27.             else if(st.top() == k)
  28.             {
  29.                 k++;
  30.                 st.pop();
  31.             }
  32.             else
  33.             {
  34.                 st.push(p[i]);
  35.             }
  36.             i++;
  37.         }
  38.         while(!st.empty() && st.top()==k)
  39.         {
  40.             k++;
  41.             st.pop();
  42.         }
  43.         if((k==(n+1)) && (st.empty()))
  44.         {
  45.             cout<<"Yes"<<endl;
  46.         }
  47.         else
  48.         {
  49.             cout<<"No"<<endl;
  50.         }
  51.     }
  52. 	return 0;
  53. }
Success #stdin #stdout 0s 4260KB
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https://ideone.com/qX4Jl0
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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