uva 10474 Where is the Marble? 解题报告

Where is the Marble?

Raju and Meena love to play with Marbles. They have got a lot of marbles with numbers written on them. At the beginning, Raju would place the marbles one after another in ascending order of the numbers written on them. Then Meena would ask Raju to find the first marble with a certain number. She would count 1...2...3. Raju gets one point for correct answer, and Meena gets the point if Raju fails. After some fixed number of trials the game ends and the player with maximum points wins. Today it's your chance to play as Raju. Being the smart kid, you'd be taking the favor of a computer. But don't underestimate Meena, she had written a program to keep track how much time you're taking to give all the answers. So now you have to write a program, which will help you in your role as Raju.

input

There can be multiple test cases. Total no of test cases is less than 65. Each test case consists begins with 2 integers: N the number of marbles and Q the number of queries Mina would make. The next N lines would contain the numbers written on the N marbles. These marble numbers will not come in any particular order. Following Q lines will have Q queries. Be assured, none of the input numbers are greater than 10000 and none of them are negative.

Input is terminated by a test case where N = 0 and Q = 0.

output

For each test case output the serial number of the case.

For each of the queries, print one line of output. The format of this line will depend upon whether or not the query number is written upon any of the marbles. The two different formats are described below:

• `x found at y', if the first marble with number x was found at position y. Positions are numbered 1, 2,..., N.
• `x not found', if the marble with number x is not present.

Look at the output for sample input for details.

sample input

4 1235155 213331230 0

sample output

CASE# 1:5 found at 4CASE# 2:2 not found3 found at 3

lower_bound返回的，是满足将一个数插入数组中且数组排序不变的最小位置，是一个地址。

upper_bound返回的，是满足上述条件的最大位置，当然也是一个地址。

upper_bound==lower_bound说明数组中原本无该数

upper_bound>lower_bound说明原数组中有该数

upper_bound-lower_bound>1说明原数组中有多个该数

#include <iostream>  #include <cstdio>  #include <cstring>  #include <algorithm>  using namespace std;    int kase=0,n,q;  int m[10005];  int main()  {      while(~scanf("%d%d",&n,&q)&&n&&q)      {          memset(m, 0, sizeof(m));          for(int i=0;i<n;i++)              scanf("%d",&m[i]);          sort(m, m+n);          printf("CASE# %d:\n",++kase);          for(int i=0;i<q;i++)          {              int x,y;              scanf("%d",&x);              y=lower_bound(m, m+n, x)-m;              if(m[y]==x)//确认数组中有该数                  printf("%d found at %d\n",x,y+1);              else                  printf("%d not found\n",x);          }      }      return 0;  }