卡在用例6，报出 segment fault with invalid memory。自己的编译器中运行也一直卡住，个人怀疑是输入缓冲区溢出，但是也不知道怎么解决以及怎么修改。求大神指点

#include<iostream>
#include<cstring>

using namespace std;
#define  M  2510


int main(){
    string s = "";
    string res1[M];
    string res2[M];
    int l = 0, r = 0, N = 0, count1 = 0;
    int L = 0, R = 0, count2 = 0;
    while(1){
        N = 0;
        cin >> s;
//        cout << s;
        while(N < s.size()){
            if(s[N] == 'W') {
                l++;
                L++;
            }
            if(s[N] == 'L') {
                r++;
                R++;
            }
            if( (l >= 11 || r >= 11) && abs(l - r) >= 2) {
                res1[count1++] = to_string(l) + ":" + to_string(r);
                l = 0;
                r = 0;
            }
            if( (L >= 21 || R >= 21) && abs(L - R) >= 2) {
                res2[count2++] = to_string(L) + ":" + to_string(R);
                L = 0;
                R = 0;
            }
            if(s[N] == 'E'){
                res1[count1++] = to_string(l) + ":" + to_string(r);
                res2[count2++] = to_string(L) + ":" + to_string(R);
                // 打印数据
                for(int i = 0; i < count1; i++){
                    cout << res1[i] << endl;
                }
                cout << endl;
                for(int i = 0; i < count2; i++){
                    cout << res2[i] << endl;
                }
                return 0;
            }
            N++;
        }
    }

}