Buggy python submission (verdict: Runtime Error):
import copy
import itertools

def funcF(p):
    return p

def funcG(p):
    return funcF(p) + p*p

N, M = (int(i) for i in input().split())
X = list(int(i) for i in input().split())
X.sort()

if N >= M:
    print ("0")
    exit()

# X[0] ... X[M-1] をN個のグループに分ける
# X[i]とX[i+1]の間でグループを分ける場合Cx=iとする（i = 0 .. M-2の個数(N-1)個のCombinationで求まる）

minS=max(X) - min(X)
for C in list(itertools.combinations(range(M-1), N-1)):
    tmpS = 0
    if C[0] > 0:
        tmpS += X[C[0]] - X[0]
    for i in range(N-2):
        if C[i+1] > C[i]+1:
            tmpS += X[C[i+1]] - X[C[i]+1]
    tmpS += X[M-1] - X[C[N-2]+1]
    if tmpS < minS:
        minS = tmpS

print("{}".format(minS))


Fixed submission:
import copy
import itertools

def funcF(p):
    return p

def funcG(p):
    return funcF(p) + p*p

N, M = (int(i) for i in input().split())
X = list(int(i) for i in input().split())
X.sort()

if N >= M:
    print ("0")
    exit()

# X[0] ... X[M-1] をN個のグループに分ける
# X[i]とX[i+1]の間でグループを分ける場合Cx=iとする（i = 0 .. M-2の個数(N-1)個のCombinationで求まる）

# minS=max(X) - min(X)
# for C in list(itertools.combinations(range(M-1), N-1)):
#     tmpS = 0
#     if C[0] > 0:
#         tmpS += X[C[0]] - X[0]
#     for i in range(N-2):
#         if C[i+1] > C[i]+1:
#             tmpS += X[C[i+1]] - X[C[i]+1]
#     tmpS += X[M-1] - X[C[N-2]+1]
#     if tmpS < minS:
#         minS = tmpS

L=[]
for i in range(M-1):
    L.append(X[i+1] - X[i])
L.sort(reverse=True)
tmpL=0
for i in L[:N-1]:
    tmpL += i

print("{}".format(X[M-1]-X[0]-tmpL))

Buggy python submission (verdict: Runtime Error):
import copy
import itertools

def funcF(p):
    return p

def funcG(p):
    return funcF(p) + p*p

N, M = (int(i) for i in input().split())
X = list(int(i) for i in input().split())
X.sort()

if N >= M:
    print ("0")
    exit()

# X[0] ... X[M-1] をN個のグループに分ける
# X[i]とX[i+1]の間でグループを分ける場合Cx=iとする（i = 0 .. M-2の個数(N-1)個のCombinationで求まる）

minS=max(X) - min(X)
for C in list(itertools.combinations(range(M-1), N-1)):
    tmpS = 0
    if C[0] > 0:
        tmpS += X[C[0]] - X[0]
    for i in range(N-2):
        if C[i+1] > C[i]+1:
            tmpS += X[C[i+1]] - X[C[i]+1]
    tmpS += X[M-1] - X[C[N-2]+1]
    if tmpS < minS:
        minS = tmpS

print("{}".format(minS))


Fixed submission:
import copy
import itertools

def funcF(p):
    return p

def funcG(p):
    return funcF(p) + p*p

N, M = (int(i) for i in input().split())
X = list(int(i) for i in input().split())
X.sort()

if N >= M:
    print ("0")
    exit()

# X[0] ... X[M-1] をN個のグループに分ける
# X[i]とX[i+1]の間でグループを分ける場合Cx=iとする（i = 0 .. M-2の個数(N-1)個のCombinationで求まる）

# minS=max(X) - min(X)
# for C in list(itertools.combinations(range(M-1), N-1)):
#     tmpS = 0
#     if C[0] > 0:
#         tmpS += X[C[0]] - X[0]
#     for i in range(N-2):
#         if C[i+1] > C[i]+1:
#             tmpS += X[C[i+1]] - X[C[i]+1]
#     tmpS += X[M-1] - X[C[N-2]+1]
#     if tmpS < minS:
#         minS = tmpS

L=[]
for i in range(M-1):
    L.append(X[i+1] - X[i])
L.sort(reverse=True)
tmpL=0
for i in L[:N-1]:
    tmpL += i

print("{}".format(X[M-1]-X[0]-tmpL))

Buggy python submission (verdict: Runtime Error):
import copy
import itertools

def funcF(p):
    return p

def funcG(p):
    return funcF(p) + p*p

N, M = (int(i) for i in input().split())
X = list(int(i) for i in input().split())
X.sort()

if N >= M:
    print ("0")
    exit()

# X[0] ... X[M-1] をN個のグループに分ける
# X[i]とX[i+1]の間でグループを分ける場合Cx=iとする（i = 0 .. M-2の個数(N-1)個のCombinationで求まる）

minS=max(X) - min(X)
for C in list(itertools.combinations(range(M-1), N-1)):
    tmpS = 0
    if C[0] > 0:
        tmpS += X[C[0]] - X[0]
    for i in range(N-2):
        if C[i+1] > C[i]+1:
            tmpS += X[C[i+1]] - X[C[i]+1]
    tmpS += X[M-1] - X[C[N-2]+1]
    if tmpS < minS:
        minS = tmpS

print("{}".format(minS))


Fixed submission:
import copy
import itertools

def funcF(p):
    return p

def funcG(p):
    return funcF(p) + p*p

N, M = (int(i) for i in input().split())
X = list(int(i) for i in input().split())
X.sort()

if N >= M:
    print ("0")
    exit()

# X[0] ... X[M-1] をN個のグループに分ける
# X[i]とX[i+1]の間でグループを分ける場合Cx=iとする（i = 0 .. M-2の個数(N-1)個のCombinationで求まる）

# minS=max(X) - min(X)
# for C in list(itertools.combinations(range(M-1), N-1)):
#     tmpS = 0
#     if C[0] > 0:
#         tmpS += X[C[0]] - X[0]
#     for i in range(N-2):
#         if C[i+1] > C[i]+1:
#             tmpS += X[C[i+1]] - X[C[i]+1]
#     tmpS += X[M-1] - X[C[N-2]+1]
#     if tmpS < minS:
#         minS = tmpS

L=[]
for i in range(M-1):
    L.append(X[i+1] - X[i])
L.sort(reverse=True)
tmpL=0
for i in L[:N-1]:
    tmpL += i

print("{}".format(X[M-1]-X[0]-tmpL))

Buggy python submission (verdict: Runtime Error):
spots_and_people = input().split()
spot_values = input().split()

N_spot = int(spots_and_people[1])
N_people = int(spots_and_people[0])

spot_values = [ int(value) for value in spot_values ]
spot_values.sort()

line_length = [ spot_values[i+1] - spot_values[i] for i in range(N_spot-1) ]
line_length.sort()


if N_spot == N_people:
  travel = 0
  
for i in range(N_people-1):
  line_length.pop(-1)
  

travel = sum(line_length)

print(travel)

Fixed submission:
spots_and_people = input().split()
spot_values = input().split()

N_spot = int(spots_and_people[1])
N_people = int(spots_and_people[0])

spot_values = [ int(value) for value in spot_values ]
spot_values.sort()

line_length = [ spot_values[i+1] - spot_values[i] for i in range(N_spot-1) ]
line_length.sort()


if N_spot <= N_people:
	travel = 0

else:
	for i in range(N_people-1):
  		line_length.pop(-1)
  

	travel = sum(line_length)

print(travel)

Buggy python submission (verdict: Runtime Error):
spots_and_people = input().split()
spot_values = input().split()

N_spot = int(spots_and_people[1])
N_people = int(spots_and_people[0])

spot_values = [ int(value) for value in spot_values ]
spot_values.sort()

line_length = [ spot_values[i+1] - spot_values[i] for i in range(N_spot-1) ]
line_length.sort()
print(line_length)

if N_spot == N_people:
  travel = 0
  
for i in range(N_people-1):
  line_length.pop(-1)
  

print(line_length)

travel = sum(line_length)

print(travel)

Fixed submission:
spots_and_people = input().split()
spot_values = input().split()

N_spot = int(spots_and_people[1])
N_people = int(spots_and_people[0])

spot_values = [ int(value) for value in spot_values ]
spot_values.sort()

line_length = [ spot_values[i+1] - spot_values[i] for i in range(N_spot-1) ]
line_length.sort()


if N_spot <= N_people:
	travel = 0

else:
	for i in range(N_people-1):
  		line_length.pop(-1)
  

	travel = sum(line_length)

print(travel)