784 B | 782 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
#inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n, w = mii()
l = mii() # n개
ans = []
crt = 0
for i in range(w):
crt += l[i]
ans.append(crt)
for i in range(w, n):
crt += l[i]
crt -= l[i - w]
ans.append(crt)
ans = [int(i / w) for i in ans]
return max(ans) - min(ans)
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()
p(f"Data Set {t}:")
p(ret)
p()