2个WA，不知道哪里的问题

9、10两个测试点WA

#include<iostream>
#include<string.h>
#include<cmath>
using namespace std;
char c;
int win = 0, lose = 0, i, imax;
int mem[68000];
void score(int n)
{
	if (mem[i]==1)
		win++;
	else if (mem[i]==-1)
		lose++;
	if (((win >= n || lose >= n) && abs(win - lose) >= 2)|| (mem[i+1] == 0 && win < n && lose < n))
	{
		printf("%d:%d\n", win, lose);
		win = 0;
		lose = 0;
	}
}
int main()
{
	memset(mem, 0, sizeof(mem));
	i = 1;
	//memory the result (with order)
	while (cin >> c && c != 'E')
	{
		if (c == 'W')
			mem[i] = 1;
		else if (c == 'L')
			mem[i] = -1;
		i++;
	}
	if (mem[1] == 0)
	{
		cout << "0:0"<<endl<<endl<< "0:0";
		return 0;
	}
	imax = i - 1;
	for (i = 1; i <= imax; i++)
		score(11);
	if (imax % 11 == 0)
		cout << "0:0";
	cout << endl;
	for (i = 1; i <= imax; i++)
		score(21);
	if (imax % 21 == 0)
		cout << "0:0";
	return 0;

}