输出 $0$ 绷不住了，while 循环直接被无视了！

abc_363_c

#include<bits/stdc++.h>
#define int long long
using namespace std;
string s;
int x,k,ans;
bool ish(string x){
	for(int i=0,j=x.size()-1;i<j;i++,j--){
		if(x[i]!=x[j])return 0;
	}
	return 1;
}
signed main(){
	cin>>x>>k;
	cin>>s;
	while(next_permutation(s.begin(),s.end())){
		cout<<s<<'\n';
		int b=1;
		for(int i=0;i<=s.size()-k;i++){
			string tmp=s.substr(i,k);
			if(ish(tmp)){
				b=0;
				break;
			}
		}
		ans+=b;
	}
	cout<<ans;
	return 0;
}