HDU-6500 Problem A. Game with string

#include <bits/stdc++.h>
#define _for(i,a,b) for(int i = (a);i < (b);i ++)
const int maxn = 100000 + 10;
using namespace std;
int main()
{
    string tmp;
    while(cin >> tmp)
    {
        int sz = tmp.size();

        int m;
        scanf("%d",&m);
        int sum = 0;
        _for(i,0,m)
        {
            int a,b;
            scanf("%d %d",&a,&b);
            sum += sz-(b-a)-1;
        }
        if(sum&0x1)
            cout << "Alice" << endl;
        else
            cout << "Bob" << endl;
    }
    return 0;
}