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<P>24点中的不可能组合<BR><BR><BR>#include<stdio.h><BR>main()<BR>{<BR>int
a[4],m,n,x,y,b,c,d,tt,gong;<BR>float
u,i,p;<BR>for(m=1;m<14;m++)<BR>for(n=1;n<14;n++)<BR>for(x=1;x<14;x++)<BR>for(y=1;y<14;y++){<BR>tt=0;<BR>for(b=0;b<4;b++)<BR>for(c=0;c<4;c++)<BR>for(d=0;d<4;d++)<BR>{<BR>if(b==0)
u=m+n;<BR>if(b==1) u=m-n;<BR>if(b==2) u=m*n;<BR>if(b==3)
u=m/n;<BR>if(c==0) i=u+x;<BR>if(c==1) i=u-x;<BR>if(c==2)
i=u*x;<BR>if(c==3) i=u/x;<BR>if(d==0) p=i+y;<BR>if(d==1)
p=i-y;<BR>if(d==2) p=i*y;<BR>if(d==3) p=i/y;<BR>if(p==24.0)
tt=1;<BR>}<BR>if(tt==0){ printf("%d,%d,%d,%d\n",m,n,x,y);
gong++;}<BR>}<BR>printf("%d\n",gong);<BR>}<BR><BR><BR>--------------------------------------------------------------------------------<BR><BR><BR><BR><BR><BR><BR><BR>1,1,1,1<BR>1,1,1,2<BR>1,1,1,3<BR>1,1,1,4<BR>1,1,1,5<BR>1,1,1,6<BR>1,1,1,7<BR>1,1,1,9<BR>1,1,1,10<BR>1,1,1,11<BR>1,1,1,13<BR>1,1,2,1<BR>1,1,2,2<BR>1,1,2,3<BR>1,1,2,4<BR>1,1,2,5<BR>1,1,2,7<BR>1,1,2,9<BR>1,1,2,10<BR>1,1,2,11<BR>1,1,2,13<BR>1,1,3,1<BR>1,1,3,2<BR>1,1,3,3<BR>1,1,3,5<BR>1,1,3,7<BR>1,1,3,9<BR>1,1,3,10<BR>1,1,3,11<BR>1,1,3,12<BR>1,1,3,13<BR>1,1,4,1<BR>1,1,4,2<BR>1,1,4,5<BR>1,1,4,7<BR>1,1,4,8<BR>1,1,4,9<BR>1,1,4,10<BR>1,1,4,11<BR>1,1,4,12<BR>1,1,4,13<BR>1,1,5,1<BR>1,1,5,2<BR>1,1,5,3<BR>1,1,5,5<BR>1,1,5,6<BR>1,1,5,7<BR>1,1,5,8<BR>1,1,5,9<BR>1,1,5,10<BR>1,1,5,11<BR>1,1,5,12<BR>1,1,5,13<BR>1,1,6,1<BR>1,1,6,5<BR>1,1,6,6<BR>1,1,6,7<BR>1,1,6,8<BR>1,1,6,9<BR>1,1,6,10<BR>1,1,6,11<BR>1,1,6,13<BR>1,1,7,1<BR>1,1,7,2<BR>1,1,7,4<BR>1,1,7,5<BR>1,1,7,6<BR>1,1,7,7<BR>1,1,7,8<BR>1,1,7,9<BR>1,1,7,11<BR>1,1,7,12<BR>1,1,7,13<BR>1,1,8,1<BR>1,1,8,2<BR>1,1,8,4<BR>1,1,8,5<BR>1,1,8,6<BR>1,1,8,7<BR>1,1,8,9<BR>1,1,8,10<BR>1,1,8,11<BR>1,1,8,12<BR>1,1,8,13<BR>1,1,9,1<BR>1,1,9,2<BR>1,1,9,3<BR>1,1,9,4<BR>1,1,9,5<BR>1,1,9,7<BR>1,1,9,8<BR>1,1,9,9<BR>1,1,9,10<BR>1,1,9,11<BR>1,1,9,12<BR>1,1,10,1<BR>1,1,10,3<BR>1,1,10,5<BR>1,1,10,6<BR>1,1,10,7<BR>1,1,10,8<BR>1,1,10,9<BR>1,1,10,10<BR>1,1,10,11<BR>1,1,11,1<BR>1,1,11,3<BR>1,1,11,4<BR>1,1,11,5<BR>1,1,11,6<BR>1,1,11,7<BR>1,1,11,8<BR>1,1,11,9<BR>1,1,11,10<BR>1,1,12,3<BR>1,1,12,4<BR>1,1,12,5<BR>1,1,12,6<BR>1,1,12,7<BR>1,1,12,8<BR>1,1,12,9<BR>1,1,12,13<BR>1,1,13,1<BR>1,1,13,3<BR>1,1,13,4<BR>1,1,13,5<BR>1,1,13,6<BR>1,1,13,7<BR>1,1,13,8<BR>1,1,13,12<BR>1,1,13,13<BR>1,2,1,1<BR>1,2,1,2<BR>1,2,1,3<BR>1,2,1,4<BR>1,2,1,5<BR>1,2,1,7<BR>1,2,1,9<BR>1,2,1,10<BR>1,2,1,11<BR>1,2,1,13<BR>1,2,2,1<BR>1,2,2,2<BR>1,2,2,3<BR>1,2,2,5<BR>1,2,2,7<BR>1,2,2,8<BR>1,2,2,9<BR>1,2,2,10<BR>1,2,2,11<BR>1,2,2,13<BR>1,2,3,1<BR>1,2,3,2<BR>1,2,3,3<BR>1,2,3,5<BR>1,2,3,6<BR>1,2,3,7<BR>1,2,3,9<BR>1,2,3,10<BR>1,2,3,11<BR>1,2,3,13<BR>1,2,4,1<BR>1,2,4,5<BR>1,2,4,7<BR>1,2,4,9<BR><BR>......<BR>13,13,13,7<BR>13,13,13,8<BR>13,13,13,9<BR>13,13,13,13<BR><BR><BR>19150<BR><BR><BR>--------------------------------------------------------------------------------<BR><BR>24点计算<BR><BR><BR><BR> </P></TD>
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