Submission #2867983

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Source Code Expand

#include<iostream>
using namespace std;
int a[100005],n,x,s=0;
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>x;
		if(a[x]==1)a[x]=0;
		else a[x]=1;
	}
	for(int i=1;i<=100005;i++)if(a[i]==1)s++;
	cout<<s<<endl;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:13:34: warning: iteration 100004u invokes undefined behavior [-Waggressive-loop-optimizations]
  for(int i=1;i<=100005;i++)if(a[i]==1)s++;
                                  ^
./Main.cpp:13:15: note: containing loop
  for(int i=1;i<=100005;i++)if(a[i]==1)s++;
               ^

Judge Result