分母是一定的C(m,3) 树状数组求每一个数能够在那些段中出现,若x出如今了s段中,分子加上w[x]*C(s,3) Victor and Toys Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/131072 K (Java/Others) Total Submission(s): 331 Accepted Submission(s): 118 Problem Description Victor has n t…
pre[i]第i位数往前走多少位碰到和它同样的数 dp[i]表示长度为i的子串,dp[i]能够由dp[i-1]加上从i到n的pre[i]>i-1的数减去最后一段长度为i-1的断中的不同的数得到.... 爆int+有点卡内存.... Substrings Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2300 Accepted…
pid=5654">[HDOJ 5654] xiaoxin and his watermelon candy(离线+树状数组) xiaoxin and his watermelon candy Time Limit: 4000/4000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 233 Accepted Submission(s): 61 Problem Des…
敌兵布阵 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 21831 Accepted Submission(s): 9590 Problem Description C国的死对头A国这段时间正在进行军事演习,所以C国间谍头子Derek和他手下Tidy又开始 忙乎了.A国在海岸线沿直线布置了N个工兵营地,Derek和Tidy的任务就…