In this **HackerRank Awk - 3 problem solution** There are N integers in an array A. All but one integer occur in pairs. Your task is to find the number that occurs only once.

**Input Format**

The first line of the input contains an integer N, indicating the number of integers. The next line contains N space-separated integers that form the array A.

**Constraints**

1 <= N < 100

N % 2 = 1 (N is an odd number)

0 <= A[i] <= 100, relate to [1,N]

**Output Format**

Output S, the number that occurs only once.

## Problem solution.

awk '{ if ((($2 + $3 + $4) / 3) >= 80) print $0,": A"; else if ((($2 + $3 + $4) / 3) >= 60) print $0,": B"; else print $0,": FAIL"; }'

## Second solution.

awk '{split($line,a," "); avg=0 avg+=$2 avg+=$3 avg+=$4 avg/=3 #print avg if(avg >= 80){ print $line" : A" } else if(avg >= 60){ print $line" : B" } else if(avg >= 50){ print $line" : C" } else{ print $line" : FAIL" } }'

## Third solution.

awk '{ total=$2+$3+$4; avg=total/3; if ( avg >= 80 ) grade="A"; else if ( avg >= 60) grade ="B"; else if (avg >= 50) grade ="C"; else grade="FAIL"; print $1,$2,$3,$4" :",grade; }'

## Fourth solution.

awk '{ if((($2+$3+$4)/3)>=80) print $1,$2,$3,$4,": A"; else if((($2+$3+$4)/3)>=60) print $1,$2,$3,$4,": B"; else if((($2+$3+$4)/3)>=50) print $1,$2,$3,$4,": C"; else print $1,$2,$3,$4,": FAIL"; }'

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