The start of substring is the left-closed and right-open interval, that is, the end position of [1,3) is 2. Don't make a mistake.
Other information on this point is as follows: https://www.cnblogs.com/owenandhisfriends/p/6892292.html
The start of substring is the left-closed and right-open interval, that is, the end position of [1,3) is 2. Don't make a mistake.
Other information on this point is as follows: https://www.cnblogs.com/owenandhisfriends/p/6892292.html