Easy Problem from Rujia Liu?
By Rujia Liu 
China
Timelimit: 2
China ChinaThough Rujia Liu usually sets hard problems for contests (for example, regional contests like Xi'an 2006, Beijing 2007 and Wuhan 2009, or UVa OJ contests like Rujia Liu's Presents 1 and 2), he occasionally sets easy problem (for example, 'the Coco-Cola Store' in UVa OJ), to encourage more people to solve his problems :D
Given an array, your task is to find the k-th occurrence (from left to right) of an integer v. To make the problem more difficult (and interesting!), you'll have to answer m such queries.
There are several test cases. The first line of each test case contains two integers n, m (1 ≤ n, m ≤ 100,000), the number of elements in the array, and the number of queries. The next line contains n positive integers not larger than 1,000,000. Each of the following m lines contains two integer k and v (1 ≤ k ≤ n, 1 ≤ v ≤ 1,000,000).
The input is terminated by end-of-file (EOF). The size of input file does not exceed 5 MB.
For each query, print the 1-based location of the occurrence. If there is no such element, output 0 instead.
| Sample Input | Sample Output |
|
8 4 |
2 |