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  • Codeforces 706B Interesting drink

    B. Interesting drink
    time limit per test:2 seconds
    memory limit per test:256 megabytes
    input:standard input
    output:standard output

    Vasiliy likes to rest after a hard work, so you may often meet him in some bar nearby. As all programmers do, he loves the famous drink "Beecola", which can be bought in n different shops in the city. It's known that the price of one bottle in the shop i is equal to xi coins.

    Vasiliy plans to buy his favorite drink for q consecutive days. He knows, that on the i-th day he will be able to spent mi coins. Now, for each of the days he want to know in how many different shops he can buy a bottle of "Beecola".

    Input

    The first line of the input contains a single integer n (1 ≤ n ≤ 100 000) — the number of shops in the city that sell Vasiliy's favourite drink.

    The second line contains n integers xi (1 ≤ xi ≤ 100 000) — prices of the bottles of the drink in the i-th shop.

    The third line contains a single integer q (1 ≤ q ≤ 100 000) — the number of days Vasiliy plans to buy the drink.

    Then follow q lines each containing one integer mi (1 ≤ mi ≤ 109) — the number of coins Vasiliy can spent on the i-th day.

    Output

    Print q integers. The i-th of them should be equal to the number of shops where Vasiliy will be able to buy a bottle of the drink on the i-th day.

    Example
    Input
    5
    
    3 10 8 6 11
    4
    1
    10
    3
    11
    Output
    0
    
    4
    1
    5
    Note

    On the first day, Vasiliy won't be able to buy a drink in any of the shops.

    On the second day, Vasiliy can buy a drink in the shops 1, 2, 3 and 4.

    On the third day, Vasiliy can buy a drink only in the shop number 1.

    Finally, on the last day Vasiliy can buy a drink in any shop.

    题目链接:http://codeforces.com/problemset/problem/706/B

    分析:二分的简单应用吧!在区间内查找上限下限,然后根据这些求出即可!

    下面给出AC代码:

     1 #include <bits/stdc++.h>
     2 using namespace std;
     3 int main()
     4 {
     5     int a[100010];
     6     int n,i,m,num;
     7     while(scanf("%d",&n)!=EOF)
     8     {
     9         for(i=1;i<=n;i++)
    10             scanf("%d",&a[i]);
    11         sort(a+1,a+1+n);
    12         scanf("%d",&m);
    13         while(m--)
    14         {
    15             scanf("%d",&num);
    16             if(num<a[1])
    17                 printf("0
    ");
    18             else if(num>=a[n])
    19                 printf("%d
    ",n);
    20             else
    21             {
    22                 int left=1,right=n;
    23                 int mid,ans;
    24                 while(left<=right)
    25                 {
    26                     mid=(left+right)/2;
    27                     if(a[mid]<=num)
    28                     {
    29                         ans=mid;
    30                         left=mid+1;
    31                     }
    32                     else right=mid-1;
    33                 }
    34                 printf("%d
    ",ans);
    35             }
    36         }
    37     }
    38     return 0;
    39 }
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  • 原文地址:https://www.cnblogs.com/ECJTUACM-873284962/p/6501907.html
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