algorithms
백준 (BOJ)
[BOJ]백준 1011번: Fly me to the Alpha Centauri (baekjoon 1011)
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1011번: Fly me to the Alpha Centauri
코드
import java.io.*;
import java.util.Arrays;
public class B1011 {
static int T, x, y, ans, e;
static long[] md = new long[100000];
static long pos;
static String in;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
T = Integer.parseInt(br.readLine());
initMobileDevice();
for (int i = 0; i < T; i++) {
in = br.readLine();
x = Integer.parseInt(in.split(" ")[0]);
y = Integer.parseInt(in.split(" ")[1]);
pos = 0;e = y - x;
ans = Arrays.binarySearch(md, e);
if (ans < 0) {
ans = Math.abs(ans) - 1;
}
bw.write(ans + "\n");
bw.flush();
}
bw.close();
}
public static void initMobileDevice() {
md[1] = 1;
for (int i = 2; i < 100000; i++) {
md[i] = ((long)i / 2) * (((long)i / 2) + 1);
md[i] += (i % 2 == 0) ? 0 : (i / 2) + 1;
}
}
}