zoukankan      html  css  js  c++  java
  • URAL 1196. History Exam (二分)

    1196. History Exam

    Time limit: 1.5 second
    Memory limit: 64 MB
    Professor of history decided to simplify the examination process. At the exam, every student should write a list of historic dates she knows (she should write the years only and, of course, must be able to explain what event took place in this or that year). Professor has a list of dates that students must know. In order to decide upon the student's mark, Professor counts the number of dates in the student's list that are also present in his list. The student gets her mark according to the number of coincidences.
    Your task is to automatize this process. Write a program that would count the number of dates in the student's list that also occur in Professor's list.

    Input

    The first line contains the number N of dates in Professor's list, 1 ≤ N ≤ 15000. The following Nlines contain this list, one number per line. Each date is a positive integer not exceeding 109. Professor's list is sorted in non-descending order. The following line contains the number M of dates in the student's list, 1 ≤ M ≤ 106. Then there is the list itself; it is unsorted. The dates here satisfy the same restriction. Both in Professor's and in the student's lists dates can appear more than once.

    Output

    Output the number of dates in the student's that are also contained in Professor's list.

    Sample

    input output
    2
    1054
    1492
    4
    1492
    65536
    1492
    100
    
    2
    




    题意:找出第一和第二个序列中都出现(同意反复累加)过的字符个数。

    解析:因为第一个有序的,所以我们遍历第二个序列的同一时候对第一个序列二分搜索答案。

    PS:本题有个非常诡异的现象:G++跑了1.5s+。可是VC++居然才跑0.343s。

    。。貌似仅仅有VC++才干过。



    AC代码:

    #include <cstdio>
    using namespace std;
    
    int a[15002];
    
    int main(){
        #ifdef sxk
            freopen("in.txt", "r", stdin);
        #endif // sxk
    
        int n, m, ans, foo;
        while(scanf("%d", &n)==1){
            ans = 0;
            for(int i=0; i<n; i++) scanf("%d", &a[i]);
            scanf("%d", &m);
            for(int i=0; i<m; i++){
                scanf("%d", &foo);
                int l = 0, r = n - 1, m;
                if(foo < a[0] || foo > a[n-1]) continue;
                else if(foo == a[0] || foo == a[n-1]){
                    ans ++;
                    continue;
                }
                while(l <= r){
                    m = (r - l) / 2 + l;
                    if(a[m] == foo){
                        ans ++;
                        break;
                    }
                    if(a[m] < foo) l = m + 1;
                    else r = m - 1;
                }
            }
            printf("%d
    ", ans);
        }
        return 0;
    }
    



  • 相关阅读:
    个税
    MC9S08中断机制
    各大公司面试笔试
    uc/OSII 任务切换
    Source Insight 使用
    充70送70
    兔年大年30
    pip更新后报No module named pip
    MsSql Md5
    iOS UIImage扩展方法(category):放大、旋转、合并UIImage、增加渐变层、添加阴影、调节透明度、保存到相册
  • 原文地址:https://www.cnblogs.com/gavanwanggw/p/6879898.html
Copyright © 2011-2022 走看看