help 有回必关

#include<bits/stdc++.h>
using namespace std;
int a[10005],n,s=0;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    int ans=0;
    for(int j=1;j<=n;j++){
        if(a[j]+1==a[j+1]){ans++;}
        else {s=min(ans,s);ans=0;}
    }
    cout<<s;
}