[BOJ] 3048 개미 (JAVA)

https://www.acmicpc.net/problem/3048

3048번: 개미

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
	
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringBuilder sb = new StringBuilder();
    static StringTokenizer st;
    static int N1, N2, T, time, i1, i2;
    static char[] g1, g2;
    static int[] t1, t2;

    public static void main(String[] args) throws Exception {

        st = new StringTokenizer(br.readLine(), " ");
        N1 = Integer.parseInt(st.nextToken());
        N2 = Integer.parseInt(st.nextToken());
        t1 = new int[N1];
        t2 = new int[N2];
        g1 = br.readLine().toCharArray();
        g2 = br.readLine().toCharArray();
        T = Integer.parseInt(br.readLine());

        for (int i = N1 - 1; i >= 0; i--) {
            t1[i] = T + time++;
        }
        for (int i = 0; i < N2; i++) {
            t2[i] = time++;
        }

        i1 = N1 - 1;
        while (0 <= i1 || i2 < N2) {
            if (N2 <= i2) sb.append(g1[i1--]);
            else if (i1 < 0) sb.append(g2[i2++]);
            else if (t1[i1] < t2[i2]) sb.append(g1[i1--]);
            else sb.append(g2[i2++]);
        }

        System.out.print(sb);

    }
	
}