Associated Course(s):
Fork CPP

*Pairs and vectors can be used together to achieve some amazing results.* Here we will learn to use a vector that holds pairs.

You are given a **vector V of size n**. The vector hold pair of integers. Example V={(1,2),(3,4)...}. Now, you need to sum the second elements.

**Input Format:**

The first line of input contains **T** denoting the number of testcases. T testcases follow. Each testcase contains two lines of input. The first line contains n denoting the size of the array. The second line contains **2*n** elements.

**Output Format:**

For each testcase, in a new line, print the required output.

**Your Task:**

Since this is a function problem, you don't need to take any input. Just complete the provided function **sum()**.

**Constraints:**

1 <= T <= 100

1 <= n <= 10^{7}

0 <= V_{i }<= 10^{7}

**Examples:
Input:**

1

5

1 2 3 4 5 6 7 8 9 10

30

**Explanation:
Testcase1:**

v[0]= 1,2

v[1]= 3,4

v[2]= 5,6

v[3]= 7,8

v[4]= 9,10

Now we sum all the second elements of a pair. So 2+4+6+8+10=30

If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.

mantan_g | 267 |

tushki | 198 |

aksht7 | 182 |

ayush1101 | 128 |

namansharmacse17 | 110 |

ARUN_PUNDIR | 730 |

manishgupta8497 | 627 |

AMAN__JAIN | 625 |

Abhimanyu_kumar | 562 |

AJ786 | 541 |

blackshadows | 5335 |

Ibrahim Nash | 5223 |

akhayrutdinov | 5111 |

mb1973 | 4929 |

Quandray | 4584 |

Login to report an issue on this page.