uva1587

#include <stdio.h>#include <stdlib.h>

int main(){    int a[8][4],x=0,flag=0,b[20],y=0,z=0,c[20];    while(~scanf("%d%d",&a[x++][0],&a[x][1]))    {        if(a[0][0]==a[x-1][0]||a[0][0]==a[x-1][1])        {            flag++;            b[y++]=x-1;            if(a[0][0]==a[x-1][0])                b[y++]=1;            else                b[y++]=0;        }        else        {            c[z++]=x-1;        }        if(x==6)        {            if(flag<4)                printf("IMPOSSIBLE\n");            else            {                int flag1=0,ch=0,ku=0;                for(int i=0; i<6; i++,i++)                    for(int j=i+2; j<8; j++,j++)                        if(a[b[i]][b[i+1]]==a[b[j]][b[j+1]])                        {                            if(ch)                                ku=a[b[i]][b[i+1]];                            else                                ch=a[b[i]][b[i+1]];                            flag1++;

                        }                if(flag1<2)                    printf("IMPOSSIBLE\n");                else                {                    for(int i=0; i<2; i++)                        if((ku==a[c[i]][0]&&ch==a[c[i]][1])||(a[c[i]][1]==ku&&a[c[i]][0]==ch))                            flag1++;                    if(flag1<4)                        printf("IMPOSSIBLE\n");                    else                        printf("POSSIBLE\n");                }

 

            }

            x=0;            flag=0;            y=0;            z=0;

        }    }    return 0;}

转载于:https://www.cnblogs.com/Wangwanxiang/p/6415339.html

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