Time Limit: 4000/2000 MS (Java/Others)

Memory Limit: 262144/131072 K (Java/Others)

After trying hard for many years, Victor has finally received a pilot license. To have a celebration, he intends to buy himself an airplane and fly around the world. There are $n$ countries on the earth, which are numbered from $1$ to $n$. They are connected by $m$ undirected flights, detailedly the $i$-th flight connects the $u_i$-th and the $v_i$-th country, and it will cost Victor's airplane $w_i$ L fuel if Victor flies through it. And it is possible for him to fly to every country from the first country.

Victor now is at the country whose number is $1$, he wants to know the minimal amount of fuel for him to visit every country at least once and finally return to the first country.

Victor now is at the country whose number is $1$, he wants to know the minimal amount of fuel for him to visit every country at least once and finally return to the first country.

The first line of the input contains an integer $T$, denoting the number of test cases.

In every test case, there are two integers $n$ and $m$ in the first line, denoting the number of the countries and the number of the flights.

Then there are $m$ lines, each line contains three integers $u_i$, $v_i$ and $w_i$, describing a flight.

$1\leq T\leq 20$.

$1\leq n\leq 16$.

$1\leq m\leq 100000$.

$1\leq w_i\leq 100$.

$1\leq u_i, v_i \leq n$.

In every test case, there are two integers $n$ and $m$ in the first line, denoting the number of the countries and the number of the flights.

Then there are $m$ lines, each line contains three integers $u_i$, $v_i$ and $w_i$, describing a flight.

$1\leq T\leq 20$.

$1\leq n\leq 16$.

$1\leq m\leq 100000$.

$1\leq w_i\leq 100$.

$1\leq u_i, v_i \leq n$.

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