[UVA] 12406 - Help Dexter＠Morris' Blog｜PChome Online 個人新聞台

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[UVA] 12406 - Help Dexter

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  D

  Help Dexter

 


You know Dexter, right? He is a very talented young
scientist. He has a huge lab hidden inside his building. He made all possible
security arrangement to keep his naughty sister Dee Dee away from his lab. But
she always finds a way into the lab. One day Dee Dee came to the lab and
started her usual work, messing up Dexter's lab! Dexter was working on a very
important project, so he begged to her and said, "Please!!!
Not today. I will do anything for you, but please leave this lab today!!!"
Dee Dee was waiting for this chance, she said, "Ok, you do my homework I
won't disturb you today." What can Dexter do? He agreed. Dee Dee said, "My
teacher told me to write down 17 numbers. First one single digit number, second
one two digit number, ..., nth one n digit number. They will
consist of only digit 1 and 2 and the nth number should be divisible by 2n."
Dexter thought, "I have very little time to finish the project. I can't
waste my time for this silly problem, I have bigger problem to think!" So,
he sent the modified version of this problem to you. Hurry up, Dee Dee is
waiting.
InputInput starts with an integer T (≤ 300),
denoting the number of test cases.
Each case starts with two integers: p q (1 ≤ p, q
≤ 17).
OutputFor each case, print the case number first. Then you have to
find two integers (smallest and largest) which have p digits and is
divisible by 2q. The integers should contain only 1's and 2's.
If no result is found, print "impossible". If there is only
one integer, then print that integer. Otherwise print both integers (first the
smallest one then the largest one) separated by a single space.

 
  
  Sample Input
  
  
  Output for Sample Input
  
 

  32 22 12 3
  Case 1: 12Case 2: 12 22Case 3: impossible


#include <stdio.h>
#include <string.h>
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))
long long hp[2][20][20];
void dfs(int idx, long long num) {
    int i;
    for(i = 1; i <= 17; i++) {
        if(num%(1<<i) == 0) {
            hp[0][idx][i] = min(hp[0][idx][i], num);
            hp[1][idx][i] = max(hp[1][idx][i], num);
        } else {
            break;
        }
    }
    if(idx == 17)
        return;
    dfs(idx+1, num*10 + 1);
    dfs(idx+1, num*10 + 2);
}
int main() {
    memset(hp[0], 127, sizeof(hp[0]));
    memset(hp[1], 0, sizeof(hp[1]));
    dfs(0, 0);
    int t, p, q, c = 0;
    scanf("%d", &t);
    while(t--) {
        scanf("%d %d", &p, &q);
        printf("Case %d: ", ++c);
        if(hp[0][p][q] == hp[1][p][q])
            printf("%lld\n", hp[0][p][q]);
        else if(hp[1][p][q] == 0)
            puts("impossible");
        else
            printf("%lld %lld\n", hp[0][p][q], hp[1][p][q]);
    }
    return 0;
}

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#12406#Help Dexter

台長： Morris

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