hdu2125之dp

Local area network

Time Limit: 10000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 410    Accepted Submission(s): 101

Problem Description

A local area network (LAN) supplies networking capability to a group of computers in close proximity to each other such as in an office building, a school, or a home. A LAN is useful for sharing resources like files, printers, games or other applications. A LAN in turn often connects to other LANs, and to the Internet or other WAN. 
In this contest, everybody is connecting with each others like the following figure.



The contest’s network was built as N rows and M columns, your computer locate at (0, 0) and the judger’s computer locate at (m-1, n-1) The code you submit would only transfer to up or right smoothly. It doesn’t matter if some accidents happened. Could you tell me how many ways from your computer to judger when a data wire was broken?

 

Input

There are multiple cases. Every case contains two integers in the first line, N, M (3<=N+M<=40). Second line contains four integers X1, Y1, X2, Y2 (0<=X1, X2<M, 0<=Y1, Y2<N, |X1+Y1-X2-Y2|=1), meaning the broken wire position.

 

Output

Print the answer in one line.

 

Sample Input

3 30 0 1 0

 

Sample Output

3

注意题目给的图，行和列别弄错了

#include<iostream>#include<cstdio>#include<cstdlib>#include<cstring>#include<string>#include<queue>#include<algorithm>#include<map>#include<iomanip>#define INF 99999999using namespace std;const int MAX=40+10;int dp[MAX][MAX];bool mark[MAX][MAX];int main(){int n,m,x1,y1,x2,y2;while(cin>>n>>m){memset(mark,false,sizeof mark);cin>>x1>>y1>>x2>>y2;dp[0][1]=1;mark[y1+1][x1+1]=mark[y2+1][x2+1]=true;for(int i=1;i<=n;++i){for(int j=1;j<=m;++j){dp[i][j]=dp[i-1][j]+dp[i][j-1];if(mark[i][j] && mark[i-1][j])dp[i][j]-=dp[i-1][j];if(mark[i][j] && mark[i][j-1])dp[i][j]-=dp[i][j-1];}}cout<<dp[n][m]<<endl;}return 0;}