CodeGenerationAndStandardization.cpp

/*
Problem: Code generation and standardization in DBMS
Description

In DataBase Management Systems, we need to generate the keys for records created. 
In many cases, a key is generated by generating a non-negative integer and is 
standardized under a string with fixed length L (by filling characters 0 at the 
beginning of the integer util the length is equal to L). For example, 
if the fixed-length L is 5, the key generated from 123 is the string 00123.
Given a positive integer n and L, and a sequence of integers a1, a2, ..., an. 
Write a program for generating corresponding keys k1, k2, ..., kn.

Input
Line 1: contains n and L (1 <= n <= 1000000, 2 <= L <= 50)
Line i+1 (i = 1,...,n): contains ai (1 <= ai <= 2000000), ai < 10
L

Output
Line i (i = 1,..., n): contains the key ki

Example
Input
5 6
54
39
40
78
1

Output
000054
000039
000040
000078
000001
*/

#include <iostream>
#include <cstdio> // Thêm thư viện để sử dụng scanf

using namespace std;

int main() {
    int n, L;
    scanf("%d %d", &n, &L); 

    for (int i = 0; i < n; i++) {
        int num;
        scanf("%d", &num); 

        int zerosToAdd = L; 

        int tempNum = num;
        while (tempNum > 0) {
            tempNum /= 10;
            zerosToAdd--;
        }

        for (int j = 0; j < zerosToAdd; j++) {
            printf("0");
        }

        printf("%d\n", num);
    }

    return 0;
}