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

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        heapq._heapify_max(cake)
        p = heapq.heappop(cake)
        q = heapq.heappop(cake)
        # print (p,q)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq.heappop(cake)
        result = t[0]
    print (max(0, result - 1))


Fixed submission:
import heapq

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        heapq._heapify_max(cake)
        p = heapq.heappop(cake)
        q = heapq.heappop(cake)
        # print (p,q)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq.heappop(cake)
        result = t[0]
    print (max(0, result - 1))

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

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        p = heapq._heappop_max(cake)
        q = heapq._heappop_max(cake)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq._heappop_max(cake)
        result = t[0]
    print (max(0, result - 1))


Fixed submission:
import heapq

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        heapq._heapify_max(cake)
        p = heapq.heappop(cake)
        q = heapq.heappop(cake)
        # print (p,q)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq.heappop(cake)
        result = t[0]
    print (max(0, result - 1))

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

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        p = heapq._heappop_max(cake)
        q = heapq._heappop_max(cake)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        result = cake[0][0]
    print (max(0, result - 1))


Fixed submission:
import heapq

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        heapq._heapify_max(cake)
        p = heapq.heappop(cake)
        q = heapq.heappop(cake)
        # print (p,q)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq.heappop(cake)
        result = t[0]
    print (max(0, result - 1))

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

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    data.sort()
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        p = heapq._heappop_max(cake)
        q = heapq._heappop_max(cake)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        result = cake[0][0]
    print (max(0, result - 1))


Fixed submission:
import heapq

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        heapq._heapify_max(cake)
        p = heapq.heappop(cake)
        q = heapq.heappop(cake)
        # print (p,q)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq.heappop(cake)
        result = t[0]
    print (max(0, result - 1))

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

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    data.sort()
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        p = heapq._heappop_max(cake)
        q = heapq._heappop_max(cake)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        result = cake[0][0]
    print (max(0, result - 1))


Fixed submission:
import heapq

if __name__ == "__main__":
    K,T = map(int, input().split())
    data = list(map(int, input().split()))
    cake = []
    for i,x in enumerate(data):
        cake.append([x, i])
    heapq._heapify_max(cake)
    while (len(cake) > 1):
        heapq._heapify_max(cake)
        p = heapq.heappop(cake)
        q = heapq.heappop(cake)
        # print (p,q)
        p[0] -= 1
        q[0] -= 1
        if p[0] > 0:
            heapq.heappush(cake, p)
        if q[0] > 0:
            heapq.heappush(cake, q)
    result = 0
    if len(cake) > 0:
        t = heapq.heappop(cake)
        result = t[0]
    print (max(0, result - 1))