C++ Could you please help me the this Arrays problem?

Use a one-dimensional array to solve the following problem. Read in 20 numbers, each of which is between 10 and 100. As each number is read validate it and store it in the array. After reading all the values, display only the unique values that the user entered. Make sure you account for the worst case scenario in which all 20 numbers are different. Use the smallest possible array to solve this problem. Input a number between 10 and 100: 10 Input a number between 10 and 100: 10 Input a number between 10 and 100: 10 Input a number between 10 and 100: 11 Input a number between 10 and 100: 11 Input a number between 10 and 100: 12 Input a number between 10 and 100: 13 Input a number between 10 and 100: 13 Input a number between 10 and 100: 13 Input a number between 10 and 100: 13 Input a number between 10 and 100: 13 Input a number between 10 and 100: 14 Input a number between 10 and 100: 14 Input a number between 10 and 100: 15 Input a number between 10 and 100: 16 Input a number between 10 and 100: 17 Input a number between 10 and 100: 18 Input a number between 10 and 100: 19 Input a number between 10 and 100: 20 Input a number between 10 and 100: 22 Printing unique numbers: 10 11 12 13 14 15 16 17 18 19 20 22