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BJ1074_Z.java
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BJ1074_Z.java
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package com.ssafy.algo;
import java.io.*;
import java.util.*;
//1074. Z
//ํฌ๊ธฐ๊ฐ 2^N ร 2^N์ธ 2์ฐจ์ ๋ฐฐ์ด์ Z๋ชจ์์ผ๋ก ํ์ํ๋ค.
//N > 1์ผ ๊ฒฝ์ฐ, ๋ฐฐ์ด์ ํฌ๊ธฐ๊ฐ 2^N-1 ร 2^N-1๋ก 4๋ฑ๋ถ ํ ํ์ ์ฌ๊ท์ ์ผ๋ก ๋ฐฉ๋ฌธํ๋ค.
//rํ c์ด์ ๋ช ๋ฒ์งธ๋ก ๋ฐฉ๋ฌธํ๋์ง ์ถ๋ ฅํ๋ผ.
public class BJ1074_Z {
static int cnt = 0;
public static void main(String[] args) throws Exception {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(in.readLine());
int N = Integer.parseInt(st.nextToken());
int r = Integer.parseInt(st.nextToken());
int c = Integer.parseInt(st.nextToken());
while (N > 0) {
int tmpN = (int) Math.pow(2, N-1); // Zํ์ ํฌ๊ธฐ
if (r < tmpN && c >= tmpN) {
c -= tmpN;
cnt += tmpN*tmpN;
} else if (r >= tmpN && c < tmpN) {
r -= tmpN;
cnt += 2*tmpN*tmpN;
} else if (r >= tmpN && c >= tmpN) {
r -= tmpN;
c -= tmpN;
cnt += 3*tmpN*tmpN;
}
N--; // 1/2 ํฌ๊ธฐ๋ก ๋ค์ ํ์
}
System.out.println(cnt);
}
}