70pts,贪心的问题出在哪

#include<bits/stdc++.h>
using namespace std;
int n,m,a[2509],ans=0;
int main()
{
	ios::sync_with_stdio(0);
	cin>>n>>m;
	for(int i=1;i<=n;i++) cin>>a[i];
	int i=1;
	while(i<=n){
		int flag=1,point=i,niu1=0,niu2=0;
		for(int j=i;j<=n;j++){
			if(a[j]==1) niu1++;
			else niu2++;
			if(a[j]!=a[i]) flag=0;
			if(flag==1||abs(niu1-niu2)<=m) point=max(point,j); 
		}
		ans++;
		i=point+1;
	}
	cout<<ans<<endl;
	return 0;
}