蒟蒻求助！！！只有50分[内牛满面]

#include<bits/stdc++.h>
using namespace std;
string s;
const int N=2501*30;
char tmp[N];
int a[N],b[N];
void work(int n,int cnt,int len){
	int sa=0,sb=0;
	while(cnt<len){
		for(int i=cnt;i<cnt+n;i++){
			sa+=a[i];sb+=b[i];
		}
		while(sa>=n||sb>=n){
			if(abs(sa-sb)>=2){
				cout<<sa<<":"<<sb<<endl;
			}
			sa=0;sb=0;
		}
		cnt+=n;
	}
	cout<<sa<<":"<<sb<<endl;
}
int main()
{
	int i=0;
	while(cin>>tmp[i]&&tmp[i]!='E')
		s+=tmp[i],i++;
	int len=s.length();
	for(int i=0;i<len;i++){
		if(s[i]=='W') a[i]++;
		else b[i]++;
	}
	int cnt=0;
	work(11,cnt,len);
	cout<<endl;
	cnt=0;
	work(21,cnt,len);
	return 0;
}

希望各位神犇指正!