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A题:Phrase String 贪心
题目链接:https://ac.nowcoder.com/acm/contest/272/A
详细题解:https://blog.csdn.net/xiang_6/article/details/84678421
B题:Xor Path 树上结点贡献次数
题目链接:https://ac.nowcoder.com/acm/contest/272/B
详细题解:https://blog.csdn.net/xiang_6/article/details/84678473
C题:Balls 概率期望&规律
题目链接:https://ac.nowcoder.com/acm/contest/272/C
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