include

include

using namespace std;

int main() { int n=0,m=0; int t=0,l=0,r=0,x=0,sum=0; cin>>n>>m; int arr[n];

for(int i=0;i<n;i++)
{
    cin>>arr[n];
}
while(m--)
{
    cin>>t>>l>>r;
    sum=0,x=0;
    if(t==1)
    {
        for(int j=l-1;j<=r-1;j+=2)
        {
            x = arr[j];
            arr[j] = arr[j+1];
            arr[j+1] = x;
        }
    }
    else if(t==2)
    {
        sum = 0;
        for(int k=l-1;k<=r-1;k++)
        {
            sum+=arr[k];
        }
        cout<<sum<<endl;

Can anyone explain the error in this code
    }
}
return 0;

}