小红的好数组

求大佬帮忙调一下WA40pts求调

#include <bits/stdc++.h>
using namespace std;
int n, k;
int a[1005];
int cnt, ans;
bool flag; 


int main(){
    cin >> n >> k;
    for (int i=1; i<=n; i++) cin >> a[i];
    for (int l=1; l<=n-k+1; l++){
    	flag = false;
    	cnt = 0;
        int r = l+k-1;
        for (int i=l; i<=(l+r)/2; i++){
        	if (a[i]!=a[r-(l-i)]) cnt ++;
		}
		if (cnt == 1){
			ans ++;
		}
    }
    cout << ans;
    return 0;
}

咋改？？？