Asked to use the sort order, use the upper _bound, and the lower _bound

CodePudding user response:

Saved to first define an array, the input array in the array, and then input to query number, array, define a symbol such as a flag. The query to a flag++, the final output value of the flag

CodePudding user response:

Rank order
The same number are next to each other, then nothing to say in the
Vector Accept input number
Sort have ready-made methods can be invoked