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Commit 3b98755

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issue sowon-dev#42 9663
1 parent 60eb82c commit 3b98755

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β€Žsrc/backjoon/_9663.java

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package backjoon;
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// https://www.acmicpc.net/problem/9663
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// N-Queen
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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public class _9663 {
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public static int[] arr;
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public static int N;
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public static int count = 0;
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public static void main(String[] args) throws IOException {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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N = Integer.parseInt(br.readLine());
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arr = new int[N];
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nQueen(0);
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System.out.println(count);
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}
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public static void nQueen(int depth) {
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// λͺ¨λ“  μ›μ†Œλ₯Ό λ‹€ μ±„μš΄ μƒνƒœλ©΄ count 증가 및 return
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if (depth == N) {
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count++;
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return;
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}
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for (int i = 0; i < N; i++) {
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arr[depth] = i;
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// 놓을 수 μžˆλŠ” μœ„μΉ˜μΌ 경우 μž¬κ·€ν˜ΈμΆœ
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if (Possibility(depth)) {
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nQueen(depth + 1);
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}
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}
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}
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public static boolean Possibility(int col) {
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for (int i = 0; i < col; i++) {
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// 같은 행에 μ‘΄μž¬ν•  경우
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if (arr[col] == arr[i]) {
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return false;
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}
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// λŒ€κ°μ„ μƒμ— λ†“μ—¬μžˆλŠ” 경우
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else if (Math.abs(col - i) == Math.abs(arr[col] - arr[i])) {
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return false;
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}
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}
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return true;
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}
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}
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/*
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input
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8
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output
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92
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*/

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