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- #include <iostream>
- using namespace std;
- int main(){
- int n,v,i;
- cin>>n;
- v=0;
- int a[n];
- for(i=0;i<n;i++)
- {
- cin>>a[i];
- }
- for(i=1;i<=n;i++)
- {
- if((a[i]-a[i-1])==1)
- {
- v++;
- }
- }
- cout<<v;
- return 0;
- }
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