HDOJ 5610 Baby Ming and Weight lifting(枚举)



Baby Ming and Weight lifting

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)

Total Submission(s): 68    Accepted Submission(s): 32


[align=left]Problem Description[/align]

Baby Ming is fond of weight lifting. He has a barbell pole(the weight of which can be ignored) and two different kinds of barbell disks(the weight of which are respectively
a
and b),
the amount of each one being infinite.

Baby Ming prepare to use this two kinds of barbell disks to make up a new one weighted
C(the
barbell must be balanced), he want to know how to do it.



 

[align=left]Input[/align]

In the first line contains a single positive integer
T,
indicating number of test case.

For each test case:

There are three positive integer a,b,
and C.

1≤T≤1000,0<a,b,C≤1000,a≠b

 

[align=left]Output[/align]

For each test case, if the barbell weighted
C
can’t be made up, print Impossible.

Otherwise, print two numbers to indicating the numbers of
a
and b
barbell disks are needed. (If there are more than one answer, print the answer with minimum
a+b)

 

[align=left]Sample Input[/align]

2
1 2 6
1 4 5

 

[align=left]Sample Output[/align]

2 2
Impossible

 

题意：有两个杠铃片，重量分别为a,b。要想使杠铃总重量为C，需要a，b的个数分别为多少？要求输出的num_a，num_b使得num_a+num_b最小。

题解：杠铃左右两边重量相等的，只考虑一边就可以了，枚举使得num_a*a+num_b*b=C/2的最小的num_a,num_b。最后输出记得乘以2就行了。

代码如下：

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
#define INF 0x3f3f3f

int main()
{
int t,a,b,C;
int n,cnt_a,cnt_b,i,j;
scanf("%d",&t);
while(t--)
{
scanf("%d%d%d",&a,&b,&C);
cnt_a=INF; cnt_b=INF;
for(i=0;;++i)
{
for(j=0;;++j)
{
if((a*i+b*j)*2>C)
break;
if((a*i+b*j)*2==C)
{
if(i+j<cnt_a+cnt_b)
{
cnt_a=i;
cnt_b=j;
}
}
}
if(a*i>C)
break;
}
if(cnt_a==INF&&cnt_b==INF)
printf("Impossible\n");
else
printf("%d %d\n",cnt_a*2,cnt_b*2);
}
return 0;
}