本文主要是介绍B - Bridging signals （LIS），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
点击打开链接
B - Bridging signals
'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up completely, making the signals on the chip connecting the ports of two functional blocks cross each other all over the place. At this late stage of the process, it is too
expensive to redo the routing. Instead, the engineers have to bridge the signals, using the third dimension, so that no two signals cross. However, bridging is a complicated operation, and thus it is desirable to bridge as few signals as possible. The call for a computer program that finds the maximum number of signals which may be connected on the silicon surface without rossing each other, is imminent. Bearing in mind that there may be housands of signal ports at the boundary of a functional block, the problem asks quite a lot of the programmer. Are you up to the task?
Figure 1. To the left: The two blocks' ports and their signal mapping (4,2,6,3,1,5). To the right: At most three signals may be routed on the silicon surface without crossing each other. The dashed signals must be bridged.
A typical situation is schematically depicted in figure 1. The ports of the two functional blocks are numbered from 1 to p, from top to bottom. The signal mapping is described by a permutation of the numbers 1 to p in the form of a list of p unique numbers in the range 1 to p, in which the i:th number pecifies which port on the right side should be connected to the i:th port on the left side.
Two signals cross if and only if the straight lines connecting the two ports of each pair do.
expensive to redo the routing. Instead, the engineers have to bridge the signals, using the third dimension, so that no two signals cross. However, bridging is a complicated operation, and thus it is desirable to bridge as few signals as possible. The call for a computer program that finds the maximum number of signals which may be connected on the silicon surface without rossing each other, is imminent. Bearing in mind that there may be housands of signal ports at the boundary of a functional block, the problem asks quite a lot of the programmer. Are you up to the task?
Figure 1. To the left: The two blocks' ports and their signal mapping (4,2,6,3,1,5). To the right: At most three signals may be routed on the silicon surface without crossing each other. The dashed signals must be bridged.
A typical situation is schematically depicted in figure 1. The ports of the two functional blocks are numbered from 1 to p, from top to bottom. The signal mapping is described by a permutation of the numbers 1 to p in the form of a list of p unique numbers in the range 1 to p, in which the i:th number pecifies which port on the right side should be connected to the i:th port on the left side.
Two signals cross if and only if the straight lines connecting the two ports of each pair do.
4 6 4 2 6 3 1 5 10 2 3 4 5 6 7 8 9 10 1 8 8 7 6 5 4 3 2 1 9 5 8 9 2 3 1 7 4 6
3 9 1 4
错误代码（一组数据行，怎么实现多组数据输入？）
Select Code
#include <stdio.h>
#include <cstring>
#include <algorithm>
#define INF 0x3f3f3f
using namespace std;
int dp[30020],a[30020];
int main()
{int n;scanf("%d",&n);while(n--){int m;scanf("%d",&m);for(int i=0; i<m ; i++){scanf("%d",&a[i]);dp[i]=INF;}for(int i=0; i<m; i++)*lower_bound(dp,dp+n,a[i])=a[i]; //优化 printf("%d\n",lower_bound(dp,dp+m,INF)-dp); } return 0;
} Select Code
#include<stdio.h>
#include<cstring>
#include<algorithm>
#include<iostream>
using namespace std; int a[41000];
int main()
{int N,n,i,j,t;scanf("%d",&N);while(N--){scanf("%d",&n);scanf("%d",&t);a[0]=t;int top=1;for(i=1; i<n; i++){scanf("%d",&t);if(t>=a[top-1])a[top++]=t;else{int z=0,q=top-1;while(z<=q){int mid=(z+q)/2;if(a[mid]<t)z=mid+1;elseq=mid-1;}a[z]=t;}}printf("%d\n",top);}return 0;
}
这篇关于B - Bridging signals （LIS）的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
