I am trying to solve SPOJ street parade. But i dont know what is wrong in the following code: ~~~~~

include

include

include

include

using namespace std; int main(){ int n,ne,last; cin>>n; while(n!=0){ int ar[n]; last=0; stack s; for(int i=0;i<n;i++) cin>>ar[i]; for(int i=0;i<n;i++){ if(s.top()==(last+1)){ s.pop(); last++; } else if(ar[i]==(last+1)) last++; else if(!s.empty() && s.top()<ar[i]){ cout<<"no"<<endl; continue; } else s.push(ar[i]); } cout<<"yes"<<endl; cin>>n; } return 0; }

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