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水题，nim博弈

#include<iostream>
#include<algorithm>
#include<cstdio>
using namespace std;

int main() {
    int T;scanf("%d", &T);
    for (int tcase = 1;tcase <= T;++tcase) {
        int ans = 0;int N;scanf("%d", &N);
        for (int i = 1, a, b;i <= N;++i) {
            scanf("%d %d", &a, &b);
            ans ^= (b - a - 1);
        }ans > 0 ? printf("Case %d: Alice\n", tcase) : printf("Case %d: Bob\n", tcase);
    }
}