flag = 0
for i in range(1,1000000007):
if i*2021%1000000007 == 999999999:
print(i)
flag = 1
if flag == 0:
print(0)
17812964
感悟
一次性做对
flag = 0
for i in range(1,1000000007):
if i*2021%1000000007 == 999999999:
print(i)
flag = 1
if flag == 0:
print(0)
17812964
一次性做对