Scanner와 System.out.print 보다 성능이 좋은 BufferedReader와 BufferedWriter를 사용하면 되는 문제이다.
import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
StringTokenizer st;
int num = Integer.valueOf(br.readLine());
for(int i = 0; i < num; i++) {
st = new StringTokenizer(br.readLine(), " ");
int A = Integer.valueOf(st.nextToken());
int B = Integer.valueOf(st.nextToken());
bw.write(String.valueOf(A + B) + "\n");
}
bw.flush();
bw.close();
}
}