URI Online Judge | 1424

Easy Problem from Rujia Liu?

By Rujia Liu China
Timelimit: 2

Though 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
1 3 2 2 4 3 2 1
1 3
2 4
3 2
4 2