poj 3710

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组合游戏。

import java.util.*;

public class Main {

    /**
     * @param args
     */
    static int N;
    static boolean[] cir=new boolean[100];
    static boolean[] vis=new boolean[100];
    static int[][] tree=new int[100][100];
    static int[] sta=new int [100];
    static int sp;
    public static int DFS(int s){
    int res=0;
    vis[s]=true; sta[sp++]=s;
    for(int i=0; i        if(tree[s][i]!=0){
            --tree[s][i];--tree[i][s];
            int temp;
            if(vis[i]==false)
            {temp=DFS(i)+1;}
            else{
                int temp1=sta[--sp];
                while(temp1!=i){
                    cir[temp1]=true;
                    temp1=sta[--sp];
                }
                sp++;
                return 1;
            }
            if(cir[i]==true){
                res^=temp%2;
            }
            else{
                res^=temp;
            }
        }
    }
    return res;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner cin =new Scanner(System.in);
        int t;
        while(cin.hasNextInt()){
            t=cin.nextInt();
            int res=0;
            for(int kk=0; kk            Arrays.fill(cir,false);
            Arrays.fill(vis, false);
            for(int ii=0; ii<100; ++ii)
                for(int jj=0; jj<100; ++jj)
                    tree[ii][jj]=0;
            sp=0;
        N=cin.nextInt();
        int k,t1,t2;
        k=cin.nextInt();
        for(int i=0; i            t1=cin.nextInt();
            t2=cin.nextInt();
            ++tree[t1-1][t2-1];
            ++tree[t2-1][t1-1];
        }
        res^=DFS(0);
            }
        if(res==0){
            System.out.println("Harry");
        }
        else
            System.out.println("Sally");
        }

    }

}

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