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哈希代码。。。#include <iostream>
#include <stdio.h>
using namespace std;
const int M=99991;
int n;
struct snow
{
int f[6];
int v;
struct snow *next;
};
snow s[99992];
void init(snow a)
{
a.v=0;
a.next=NULL;
}
int hash(int flake[6])
{
int i,sum;
sum=0;
for(i=0;i<6;i++)
sum=sum+flake[i];
return sum%M;
}
void insert(snow *temp,int flake[6])
{
int j;
if(temp->v==0)
{
for(j=0;j<6;j++)
temp->f[j]=flake[j];
temp->v=1;
temp->next=new snow;
temp->next->v=0;
}
else
{
temp=temp->next;
insert(temp,flake);
}
}
int judge(int a[6],int b[6])
{
int i,j;
for(i=0;i<6;i++)
{
if(a[0]==b[i])
{
for(j=1;j<6;j++)
if(a[j]!=b[(j+i)%6])
break;
if(j==6) return 1;
for(j=1;j<6;j++)
if(a[6-j]!=b[(i+j)%6])
break;
if(j==6) return 1;
}
}
return 0;
}
int search(snow *temp,int flake[6])
{
while(temp->v)
{
if(judge(temp->f,flake)==1)
return 1;
else
temp=temp->next;
}
if(temp->v==0)
return 0;
}
int main()
{
int i,j,ok;
int flake[6];
snow *temp;
for(i=0;i<99992;i++)
init(s[i]);
scanf("%d",&n);
ok=0;
for(i=0;i<n;i++)
{
for(j=0;j<6;j++)
{
scanf("%d",&flake[j]);
}
if(ok==0)
{
temp=&s[hash(flake)];
if(search(temp,flake)==0)
insert(temp,flake);
else
ok=1;
}
}
if(ok==0)
printf("No two snowflakes are alike.\n");
else
printf("Twin snowflakes found.\n");
return 0;
}
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