742 B | 742 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(s, k):
ret = ""
for i in s:
ret += chr((ord(i) - 97 - k + 26) % 26 + 97)
if "i" in ret:
return 0
return 1
def solve():
n, s = input().split()
n = int(n)
s = [*map(int, list(s))]
ret = 0
crt = s[0]
for i in range(1, n + 1):
if crt < i and s[i] > 0:
ret += i - crt
crt += i - crt
crt += s[i]
return ret
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()
p(f"Case #{t}: {ret}")