Buggy python submission (verdict: Runtime Error):
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7
    list_a = list( map( int, input().strip().split() ) )
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
        elif(K==1):
            multiplies = list_a[N-1]
        else:
            left = 0
            right = N-1
            if(K%2!=0):
                multiplies = multiplies * list_a[right] % divisor
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]

            for s in range(K//2):
                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left%=divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]


    print(multiplies)


Fixed submission:
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7
    list_a = list( map( int, input().strip().split() ) )
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
        elif(K==1):
            multiplies = list_a[N-1]
        else:
            left = 0
            right = N-1
            if(K%2!=0):
                multiplies = multiplies * list_a[right] % divisor
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]

            for s in range(K//2-1):
                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left%=divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]

            if(multiply_left < multiply_right):
                multiply_right %= divisor
                multiplies = multiplies * multiply_right % divisor

            else:
                multiply_left%=divisor
                multiplies = multiplies * multiply_left % divisor


    print(multiplies)

Buggy python submission (verdict: Runtime Error):
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7

    list_a = list( map(int, input().strip().split()) )

    """
    left, right側の2項の積で大きい方を選択
    選べるのが残り1項ならright側を選択
    """
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        flag_overzero = True
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            flag_overzero = False

        if(flag_overzero == True):
            left = 0
            right = N-1

            if(K%2 != 0):
                multiplies = multiplies * list_a[right] % divisor
                K -= 1
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]
            for k in range(K//2):

                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left %= divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]
        else:
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
    print(multiplies)


Fixed submission:
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7
    list_a = list( map( int, input().strip().split() ) )
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
        elif(K==1):
            multiplies = list_a[N-1]
        else:
            left = 0
            right = N-1
            if(K%2!=0):
                multiplies = multiplies * list_a[right] % divisor
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]

            for s in range(K//2-1):
                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left%=divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]

            if(multiply_left < multiply_right):
                multiply_right %= divisor
                multiplies = multiplies * multiply_right % divisor

            else:
                multiply_left%=divisor
                multiplies = multiplies * multiply_left % divisor


    print(multiplies)

Buggy python submission (verdict: Runtime Error):
import sys, bisect


if(__name__ == "__main__"):


    N, K = map( int, input().strip().split() )
    divisor = 10**9+7

    list_a = list( map(int, input().strip().split()) )

    """
    left, right側の2項の積で大きい方を選択
    選べるのが残り1項ならright側を選択
    """
    multiplies = 1

    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
        print(multiplies)
    else:
        list_a.sort()

        flag_overzero = True
        if(list_a[-1] < 0 and K % 2 != 0):
            flag_overzero = False
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(flag_overzero == True):
            left = 0
            right = N-1

            if(K%2 != 0):
                multiplies = multiplies * list_a[right] % divisor
                K -= 1
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]
            for k in range(K//2):

                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left %= divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]

            print(multiplies)
        else:
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """

            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor

            print(multiplies)


Fixed submission:
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7
    list_a = list( map( int, input().strip().split() ) )
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
        elif(K==1):
            multiplies = list_a[N-1]
        else:
            left = 0
            right = N-1
            if(K%2!=0):
                multiplies = multiplies * list_a[right] % divisor
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]

            for s in range(K//2-1):
                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left%=divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]

            if(multiply_left < multiply_right):
                multiply_right %= divisor
                multiplies = multiplies * multiply_right % divisor

            else:
                multiply_left%=divisor
                multiplies = multiplies * multiply_left % divisor


    print(multiplies)

Buggy python submission (verdict: Runtime Error):
import sys, bisect


if(__name__ == "__main__"):


    N, K = map( int, input().strip().split() )
    divisor = 10**9+7

    list_a = list( map(int, input().strip().split()) )

    """
    left, right側の2項の積で大きい方を選択
    選べるのが残り1項ならright側を選択
    """
    multiplies = 1

    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
        print(multiplies)
    else:
        list_a.sort()

        flag_overzero = True
        if(list_a[-1] < 0 and K % 2 != 0):
            flag_overzero = False
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(flag_overzero == True):
            left = 0
            right = N-1

            if(K%2 != 0):
                multiplies = multiplies * list_a[right] % divisor
                K -= 1
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]
            for k in range(K//2):

                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left %= divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]


            print(multiplies)
        else:
            list_a = [ abs(list_a[i]) for i in range(N)]
            list_a.sort()
            multiplies = -1
            for i in range(K):
                multiplies = multiplies * list_a[i] % divisor

            print(multiplies)


Fixed submission:
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7
    list_a = list( map( int, input().strip().split() ) )
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
        elif(K==1):
            multiplies = list_a[N-1]
        else:
            left = 0
            right = N-1
            if(K%2!=0):
                multiplies = multiplies * list_a[right] % divisor
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]

            for s in range(K//2-1):
                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left%=divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]

            if(multiply_left < multiply_right):
                multiply_right %= divisor
                multiplies = multiplies * multiply_right % divisor

            else:
                multiply_left%=divisor
                multiplies = multiplies * multiply_left % divisor


    print(multiplies)

Buggy python submission (verdict: Runtime Error):
import sys, bisect


if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7

    list_a = list( map(int, input().strip().split()) )

    """
    left, right側の2項の積で大きい方を選択
    選べるのが残り1項ならright側を選択
    """
    multiplies = 1

    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
        print(multiplies)
    else:
        list_a.sort()

        flag_overzero = True
        if(list_a[-1] < 0 and K % 2 != 0):
            flag_overzero = False
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(flag_overzero == True):
            left = 0
            right = N-1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]
            flag_left = True

            while(K>0):
                if(K>1):
                    K -= 2

                    if(multiply_left < multiply_right):
                        multiply_right %= divisor
                        multiplies = multiplies * multiply_right % divisor
                        right -= 2
                        flag_left=False
                        multiply_right = list_a[right] * list_a[right-1]

                    else:
                        multiply_left %= divisor
                        multiplies = multiplies * multiply_left % divisor
                        left += 2
                        flag_left=True
                        multiply_left = list_a[left] * list_a[left+1]

                else:
                    multiplies = multiplies * list_a[right] % divisor
                    K =0
            print(multiplies)
        else:
            list_a = [ abs(list_a[i]) for i in range(N)]
            list_a.sort()
            for i in range(K):
                multiplies = multiplies * list_a[i] % divisor
            multiplies = -multiplies %divisor

            print(multiplies)


Fixed submission:
import sys

if(__name__ == "__main__"):

    N, K = map( int, input().strip().split() )
    divisor = 10**9+7
    list_a = list( map( int, input().strip().split() ) )
    multiplies = 1
    if(N==K):
        for i in range(N):
            multiplies = multiplies * list_a[i] % divisor
    else:
        list_a.sort()
        """
        解が負になるのはN>Kの時には
        正の項が1つもなく、Kが奇数の時
        """
        if(list_a[-1] < 0 and K % 2 != 0):
            """
            全て負の項
            list_a = [-5, -3, -1]のようにソートされている
            末尾の項から選んでいく
            """
            for i in range(K):
                multiplies = multiplies * list_a[N-1-i] % divisor
        elif(K==1):
            multiplies = list_a[N-1]
        else:
            left = 0
            right = N-1
            if(K%2!=0):
                multiplies = multiplies * list_a[right] % divisor
                right -= 1
            multiply_left = list_a[left] * list_a[left+1]
            multiply_right = list_a[right] * list_a[right-1]

            for s in range(K//2-1):
                if(multiply_left < multiply_right):
                    multiply_right %= divisor
                    multiplies = multiplies * multiply_right % divisor
                    right -= 2
                    multiply_right = list_a[right] * list_a[right-1]

                else:
                    multiply_left%=divisor
                    multiplies = multiplies * multiply_left % divisor
                    left += 2
                    multiply_left = list_a[left] * list_a[left+1]

            if(multiply_left < multiply_right):
                multiply_right %= divisor
                multiplies = multiplies * multiply_right % divisor

            else:
                multiply_left%=divisor
                multiplies = multiplies * multiply_left % divisor


    print(multiplies)