#include<bits/stdc++.h>
using namespace std;
int main(){
	//freopen("char.in","r",stdin);
	//freopen("char.out","w",stdout);
	char a[100000],b;
	int c,n,s=1,max1=0;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		c=a[i];
		if(c-int(a[i-1])==1){
			s++; 
		}
		else{
            if(s>max1){
			max1=s;
		}
			s=1;
		}
	}
	cout<<max1;
	return 0;
}
```


```

#include <bits/stdc++.h>
using namespace std;
int n, cnt = 1, ans = 1;
string s;
int main()
{
	cin >> n >> s;
	for (int i = 1;i < n;i++)
	{
		if (s[i] - s[i - 1] == 1)
		{
			cnt++;
		}
		else
		{
			ans = max (ans, cnt);
			cnt = 1;
		}
	}
	cout << ans;
	return 0;
}

```cpp
输入s，n;
k=1,ans=1;
循环
判断是否是连续；
输出；
#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
string s;
cin>>n;cin>>s;
int k=1,ans=1;
for(int i=1;i<n;i++){
  if(s[i]==s[i-1]+1)k++;
else{
ans=max(ans,k);k=1;}}
cout<<ans;
return 0;}