POJ 3264 Balanced Lineup
来源:互联网 发布:郭德纲 人品 知乎 编辑:程序博客网 时间:2024/06/05 22:54
Description
For the daily milking, Farmer John's N cows (1 ≤ N ≤ 50,000) always line up in the same order. One day Farmer John decides to organize a game of Ultimate Frisbee with some of the cows. To keep things simple, he will take a contiguous range of cows from the milking lineup to play the game. However, for all the cows to have fun they should not differ too much in height.
Farmer John has made a list of Q (1 ≤ Q ≤ 200,000) potential groups of cows and their heights (1 ≤ height ≤ 1,000,000). For each group, he wants your help to determine the difference in height between the shortest and the tallest cow in the group.
Input
Lines 2..N+1: Line i+1 contains a single integer that is the height of cow i
Lines N+2..N+Q+1: Two integers A and B (1 ≤ A ≤ B ≤ N), representing the range of cows from A to B inclusive.
Output
Sample Input
6 31734251 54 62 2
Sample Output
630
打算用两种方法做,顺便区别一下,RMQ和线段树的区别。他们都都说RMQ比线段树好,我发现时间也差不了多少,虽然都没优化
AC代码如下:
线段树!
///线段树 2250MS 2404K#include<iostream>#include<cstring>#include<cstdio>#include<algorithm>#define M 50010#define inf 100000000using namespace std;struct H{ int l,r,maxx,minn;}trees[4*M];int n,m;int num[M];void build_trees(int jd ,int l,int r){ trees[jd].l=l;trees[jd].r=r; if(l==r) { trees[jd].maxx=num[l]; trees[jd].minn=num[l]; return ; } int mid = (l+r)/2; build_trees(jd*2,l,mid); build_trees(jd*2+1,mid+1,r); trees[jd].maxx=max(trees[jd*2].maxx,trees[jd*2+1].maxx); trees[jd].minn=min(trees[jd*2].minn,trees[jd*2+1].minn);}int query_max(int jd,int l,int r){ int ans=0; if(l<=trees[jd].l&&r>=trees[jd].r) return trees[jd].maxx; int mid = (trees[jd].l+trees[jd].r)/2; if(l<=mid) ans=max(ans,query_max(jd*2,l,r)) ; if(r>mid) ans=max(ans,query_max(jd*2+1,l,r)); return ans;}int query_min(int jd,int l,int r){ int ans=inf; if(l<=trees[jd].l&&r>=trees[jd].r) return trees[jd].minn; int mid = (trees[jd].l+trees[jd].r)/2; if(l<=mid) ans=min(ans,query_min(jd*2,l,r)) ; if(r>mid) ans=min(ans,query_min(jd*2+1,l,r)); return ans;}int main(){ int i,j; int a,b; while(~scanf("%d%d",&n,&m)) { memset(num,0,sizeof num); for(i=1;i<=n;i++) scanf("%d",&num[i]); build_trees(1,1,n); for(i=1;i<=m;i++) { scanf("%d%d",&a,&b); printf("%d\n",query_max(1,a,b)-query_min(1,a,b)); } } return 0;}
RMQ!!!
///RMQ 1813MS 12100K#include<iostream>#include<cstring>#include<cstdio>#include<algorithm>#define M 50010#define inf 100000000using namespace std;int n,m;int num[M];int dp1[M][30],dp2[M][30];void RMQ_min(){ int i,j; memset(dp1,0,sizeof dp1); for(i=1;i<=n;i++) dp1[i][0]=num[i]; for(j=1;1<<j<=n;j++) for(i=1;i+(1<<j)-1<=n;i++) dp1[i][j]=min(dp1[i][j-1],dp1[i+(1<<(j-1))][j-1]);}void RMQ_max(){ int i,j; memset(dp2,0,sizeof dp2); for(i=1;i<=n;i++) dp2[i][0]=num[i]; for(j=1;1<<j<=n;j++) for(i=1;i+(1<<j)-1<=n;i++) dp2[i][j]=max(dp2[i][j-1],dp2[i+(1<<(j-1))][j-1]);}int rmq_min(int l,int r){ int i,j; int k=0; while(1<<(k+1)<=r-l+1) k++; return min(dp1[l][k],dp1[r-(1<<k)+1][k]);}int rmq_max(int l,int r){ int i,j; int k=0; while(1<<(k+1)<=r-l+1) k++; return max(dp2[l][k],dp2[r-(1<<k)+1][k]);}int main(){ int i,j; int a,b; while(~scanf("%d%d",&n,&m)) { for(i=1;i<=n;i++) scanf("%d",&num[i]); RMQ_min(); RMQ_max(); for(i=1;i<=m;i++) { scanf("%d%d",&a,&b); printf("%d\n",rmq_max(a,b)-rmq_min(a,b)); } } return 0;}
- POJ 3264 Balanced Lineup
- POJ 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- Poj 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- POJ-3264-Balanced Lineup
- poj 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- POJ 3264-Balanced Lineup
- poj 3264 Balanced Lineup
- POJ 3264 Balanced Lineup
- POJ-3264-Balanced Lineup
- POJ 3264 Balanced Lineup
- POJ 3264 Balanced Lineup
- poj 3264 Balanced Lineup
- POJ 1915 Knight Moves 骑士遍历问题(跳马问题)
- TCP/IP学习(27)——协议初始化与简要的接收/发送流程
- ListView嵌套Gallery时click事件被Gallery捕获
- ZOJ-3414-Trail Walk_计算几何
- Tomcat配置连接池
- POJ 3264 Balanced Lineup
- iPhone开发 屏幕适配(3.5英寸和4英寸屏幕适配)
- jquery tmpl 模版
- C++栈
- 用批处理删除txt中指定的行和替换指定的行,以及添加指定的行
- 获取本地IP
- 证书与成绩单
- java--jsp图片验证码
- phpinfo() 查看php信息