HDU-4055:Number String】的更多相关文章

http://acm.hdu.edu.cn/showproblem.php?pid=4055 题意:给一个仅包含‘I','D','?'的字符串,’I'表示前面的数字比后面的数字要小(Increase升序),'D'表示前面的数字比前面的数字要大(Decrease降序),'?'表示有可能是'I'也有可能是'D',长度为n的字符串就有n+1个数字,在这n+1个数字里面,问符合给出的字符串的条件的序列数有多少种. 思路:dp[i][j]的定义:i表示当前枚举到第i个字符(即长度为i+1的时候的序列),j…
链接:HDU-4055:Number String 题意:给你一个字符串s,s[i] = 'D'表示排列中a[i] > a[i+1],s[i] = 'I'表示排列中a[i] < a[i+1],s[i]  = '?' 表示无限制. 题解:dp[i][j]表示前i个满足字符串条件的结尾为j的 i 的排列. 如果s[i - 1]是' I ',那么dp[i][j] = dp[i-1][1] + dp[i-1][2] + .. + dp[i-1][j-1] 如果s[i - 1]是‘D’,那么dp[i][…
Number Sequence Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N <= 1000…
Hidden String  Accepts: 437  Submissions: 2174  Time Limit: 2000/1000 MS (Java/Others)  Memory Limit: 262144/262144 K (Java/Others) 问题描述 今天是BestCoder一周年纪念日. 比赛管理员Soda有一个长度为n的字符串s. 他想要知道能否找到s的三个互不相交的子串s[l1..r1], s[l2..r2], s[l3..r3]满足下列条件: 1. 1≤l1≤r1<…
Number Sequence Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 40388    Accepted Submission(s): 16659 Problem Description Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1],…
hdu 4055: 一开始我想的递推方向想得很复杂,看了别人的博客后才醍醐灌顶: 参照他的思路和代码: #include<cstdio> #include<cstring> #include<algorithm> using namespace std; ; ; char s[N]; int dp[N][N], sum[N][N]; int main() { )) { memset(dp,,sizeof(dp)); // memset(sum,0,sizeof(sum)…
题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=4055 Number String Time Limit: 10000/5000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others) 问题描述 The signature of a permutation is a string that is computed as follows: for each pair of consecut…
Number String http://acm.hdu.edu.cn/showproblem.php?pid=4055 Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description The signature of a permutation is a string that is computed as follows: for each pai…
Number String Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1016    Accepted Submission(s): 440 Problem Description The signature of a permutation is a string that is computed as follows: fo…
Number String Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1935    Accepted Submission(s): 931 Problem Description The signature of a permutation is a string that is computed as follows: for…