CodeForces - 600B Queries about less or equal elements (二分查找 利用stl)

传送门:

http://codeforces.com/problemset/problem/600/B

Queries about less or equal elements
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output

You are given two arrays of integers a and b. For each element of the second array bj you should find the number of elements in array a that are less than or equal to the value bj.

Input

The first line contains two integers n, m (1 ≤ n, m ≤ 2·105) — the sizes of arrays a and b.

The second line contains n integers — the elements of array a ( - 109 ≤ ai ≤ 109).

The third line contains m integers — the elements of array b ( - 109 ≤ bj ≤ 109).

Output

Print m integers, separated by spaces: the j-th of which is equal to the number of such elements in array a that are less than or equal to the value bj.

Examples
Input
Copy
5 4
1 3 5 7 9
6 4 2 8
Output
Copy
3 2 1 4
Input
Copy
5 5
1 2 1 2 5
3 1 4 1 5
Output
Copy
4 2 4 2 5


分析:
题目意思:
输入数组A和B,要求输出数组A中比B[i]小的数的个数。
做法:
暴力会超时,利用二分查找
upper_bound(A, A+N,  B[i])- A;返回大于B[i]按照正序应存放的地址,取地址后是下标。

code:
#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
#define max_v 200005
int a[max_v],b[max_v];
int main()
{
    int n,m;
    while(cin>>n>>m)
    {
        for(int i=0;i<n;i++)
            cin>>a[i];
        for(int i=0;i<m;i++)
            cin>>b[i];
        sort(a,a+n);
        for(int i=0;i<m;i++)
        {
            if(i==m-1)
            {
                printf("%d\n",upper_bound(a,a+n,b[i])-a);
            }else
            {
                printf("%d ",upper_bound(a,a+n,b[i])-a);
            }
        }
    }
    return 0;
}

 

posted @ 2018-07-25 11:53  西*风  阅读(214)  评论(0编辑  收藏  举报