摘要：
Times：5000ms； Memory limit：262144 kB 给定字符串S（|S|<=5000），下标由1开始。然后Q个问题（Q<=1e6），对于每个问题，给定L，R，回答区间[L,R]里有多少个回文串。 请想出两种或者以上的方法。 分界线 方法1：区间DP。 容斥一下，dp[i][j] 阅读全文
摘要：
Genos recently installed the game Zuma on his phone. In Zuma there exists a line of n gemstones, the i-th of which has color ci. The goal of the game 阅读全文
摘要：
Ivan has n different boxes. The first of them contains some balls of n different colors. Ivan wants to play a strange game. He wants to distribute the 阅读全文