# Practice on Toph

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# Just Solve It

By Bishal_G · Limits 2s, 512 MB

You are given an array $A$ of length $N$ consisting of integer numbers. Your task is to determine the value returned by following “Solve()” function.

var Solve(var N,var A[]) {
var count=0;
for(var i=1; i<=N; i++) {
for(var j=i+1; j<=N; j++) {
var product=A[i]*A[j];
if( LSD(product) == 0 ) {
count++;
}
}
}
return count;
}


Here, Least Significant Digit (LSD) refers to the digit which occurs rightmost in its decimal representation.

## Input

Input starts with an integer $T$ ($1 \le T \le 20$), denoting the number of test cases. Each case contains an integer $N$ ($1 ≤ N ≤ 100000$) denoting the number of elements of array $A$. The next line will contain $N$ nonnegative integers not greater than $10^{12}$ separated by a space, denoting the elements of the array.

## Output

For each case of input, output the result of above function as described in the problem statement.

## Sample

InputOutput
1
4
1 2 3 5

1


### Statistics

64% Solution Ratio

showmic96Earliest, Apr '18

md_jakariyaFastest, 0.1s

nasibsuLightest, 131 kB

ArobindoShortest, 362B

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