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HDU ACM 1025 Constructing Roads In JGShining's Kingdom->二分求解LIS+O(NlogN)
#include using namespace std; //BFS+优先队列(打印路径) #define N 500005 int c[N]; int dp[N]; //dp[i]保存的是长度为i的最长不降子序列的最小尾元素 int BS(int n,int x) //二分查找下标,当x比所有元素小时下标为1,比所有元素大时下标为n+1. { int low,high,mid; ...
分类:其他好文   时间:2015-06-06 13:35:52    阅读次数:150
!HDU 1025 Constructing Roads In JGShining's Kingdom--DP--(LIS算法)
题意:在马路两边分别有n个城市,给出期望的n条路用于连接两边的城市,但是要求路不能有交叉,求在期望的n条中路实际能保留下来的最大的条数 分析:这题很好 1.本题抽象出来的模型应该是求最长上升(不下降)子序列 2.LIS的 nlog(n)算法: O(n^2) 的算法是dp[i]保留以i结尾的最长上升子序列的长度,令k=dp[i],O(nlog(n))算法是从k的角度出发,设d(k)为在长度为...
分类:编程语言   时间:2015-06-06 09:20:01    阅读次数:130
hdu 1025 Constructing Roads In JGShining’s Kingdom 【dp+二分】
题目链接:http://acm.acmcoder.com/showproblem.php?pid=1025题意:本求最长公共子序列,但数据太多。转化为求最长不下降子序列。太NB了。复杂度n*log(n).解法:dp+二分代码:#include #include #include #include #include...
分类:其他好文   时间:2015-06-05 17:31:32    阅读次数:116
【dfs+连通分量】Bzoj1123 POI2008 BLO
DescriptionByteotia城市有n个 towns m条双向roads. 每条 road 连接 两个不同的 towns ,没有重复的road. 所有towns连通。Input输入n 2 #include 3 #define ll long long 4 using namespace st...
分类:其他好文   时间:2015-06-04 22:34:21    阅读次数:162
poj3067 Japan
Description Japan plans to welcome the ACM ICPC World Finals and a lot of roads must be built for the venue. Japan is tall island with N cities on the East coast and M cities on the West coast (M <...
分类:其他好文   时间:2015-06-03 21:38:18    阅读次数:143
LightOJ1002---Country Roads (最短路变形)
I am going to my home. There are many cities and many bi-directional roads between them. The cities are numbered from 0 to n-1 and each road has a cost. There are m roads. You are given the number of m...
分类:其他好文   时间:2015-06-02 22:03:57    阅读次数:175
POJ 2421 Constructing Roads (最小生成树)
Constructing RoadsTime Limit:2000MSMemory Limit:65536KB64bit IO Format:%I64d & %I64uSubmitStatusPracticePOJ 2421Appoint description:DescriptionThere a...
分类:其他好文   时间:2015-06-02 21:40:47    阅读次数:115
HDU 1301 Jungle Roads (最小生成树)
Jungle RoadsTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5037Accepted Submission(s): 3656Proble...
分类:其他好文   时间:2015-06-02 19:40:49    阅读次数:115
hdoj 1301 Jungle Roads
Jungle RoadsTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5012Accepted Submission(s): 3641Proble...
分类:其他好文   时间:2015-05-31 16:46:21    阅读次数:174
HDU1102 Constructing Roads (最小生成树)
Prim算法求最小生成树#include #include #include using namespace std; const int N=110; const int INF=0x3f3f3f3f; int n,ans; int map[N][N],dis[N],vis[N]; void Prim(){ int i; for(i=1;i<=n;i++){ ...
分类:其他好文   时间:2015-05-27 13:54:36    阅读次数:150
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