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- import java.util.*;
-
- public class Main {
- public static void main(String[] args) {
- Scanner cin = new Scanner(System.in);
- int t = cin.nextInt();
- while(t-->0){
- int n = cin.nextInt();
- System.out.println(String.format("%02d:%02d:%02d",n/3600,n%3600/60,n%60));//直接一行就OK
- }
-
- }
- }
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