Codeforces Beta Round 23 |
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Finished |

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constructive algorithms

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C. Oranges and Apples

time limit per test

1.5 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputIn 2*N* - 1 boxes there are apples and oranges. Your task is to choose *N* boxes so, that they will contain not less than half of all the apples and not less than half of all the oranges.

Input

The first input line contains one number *T* — amount of tests. The description of each test starts with a natural number *N* — amount of boxes. Each of the following 2*N* - 1 lines contains numbers *a*_{i} and *o*_{i} — amount of apples and oranges in the *i*-th box (0 ≤ *a*_{i}, *o*_{i} ≤ 10^{9}). The sum of *N* in all the tests in the input doesn't exceed 10^{5}. All the input numbers are integer.

Output

For each test output two lines. In the first line output YES, if it's possible to choose *N* boxes, or NO otherwise. If the answer is positive output in the second line *N* numbers — indexes of the chosen boxes. Boxes are numbered from 1 in the input order. Otherwise leave the second line empty. Separate the numbers with one space.

Examples

Input

2

2

10 15

5 7

20 18

1

0 0

Output

YES

1 3

YES

1

Codeforces (c) Copyright 2010-2023 Mike Mirzayanov

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