結果
| 問題 |
No.38 赤青白ブロック
|
| コンテスト | |
| ユーザー |
fujisu
|
| 提出日時 | 2015-03-07 05:05:08 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 332 ms / 5,000 ms |
| コード長 | 3,250 bytes |
| コンパイル時間 | 2,182 ms |
| コンパイル使用メモリ | 78,048 KB |
| 実行使用メモリ | 56,536 KB |
| 最終ジャッジ日時 | 2024-12-23 12:44:59 |
| 合計ジャッジ時間 | 5,168 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| other | AC * 27 |
ソースコード
import java.io.IOException;
import java.util.InputMismatchException;
public class Main {
int r, b;
char[] c;
int ans;
void backtrack(int k, boolean[] use, int cnt) {
if (ans <= cnt) {
return;
}
if (20 <= k) {
if (check(use)) {
ans = cnt;
}
} else {
use[k] = true;
backtrack(k + 1, use, cnt + 1);
use[k] = false;
backtrack(k + 1, use, cnt);
}
}
boolean check(boolean[] use) {
StringBuilder tmp = new StringBuilder("");
int id = 0;
for (int i = 0; i < 30; i++) {
if (c[i] == 'W') {
tmp = tmp.append(c[i]);
} else {
if (!use[id]) {
tmp = tmp.append(c[i]);
}
id++;
}
}
char[] nc = tmp.toString().toCharArray();
int n = nc.length;
for (int i = 0; i < n; i++) {
if (nc[i] == 'R') {
if (0 <= i - r && nc[i - r] == 'R') {
return false;
}
if (i + r < n && nc[i + r] == 'R') {
return false;
}
} else if (nc[i] == 'B') {
if (0 <= i - b && nc[i - b] == 'B') {
return false;
}
if (i + b < n && nc[i + b] == 'B') {
return false;
}
}
}
return true;
}
void run() {
MyScanner sc = new MyScanner();
r = sc.nextInt();
b = sc.nextInt();
c = sc.next().toCharArray();
ans = 30;
backtrack(0, new boolean[20], 0);
System.out.println(30-ans);
}
public static void main(String[] args) {
new Main().run();
}
public void mapDebug(int[][] a) {
System.out.println("--------map display---------");
for (int i = 0; i < a.length; i++) {
for (int j = 0; j < a[i].length; j++) {
System.out.printf("%3d ", a[i][j]);
}
System.out.println();
}
System.out.println("----------------------------" + '\n');
}
class MyScanner {
int read() {
try {
return System.in.read();
} catch (IOException e) {
throw new InputMismatchException();
}
}
boolean isSpaceChar(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
boolean isEndline(int c) {
return c == '\n' || c == '\r' || c == -1;
}
int nextInt() {
return Integer.parseInt(next());
}
int[] nextIntArray(int n) {
int[] array = new int[n];
for (int i = 0; i < n; i++)
array[i] = nextInt();
return array;
}
long nextLong() {
return Long.parseLong(next());
}
long[] nextLongArray(int n) {
long[] array = new long[n];
for (int i = 0; i < n; i++)
array[i] = nextLong();
return array;
}
double nextDouble() {
return Double.parseDouble(next());
}
double[] nextDoubleArray(int n) {
double[] array = new double[n];
for (int i = 0; i < n; i++)
array[i] = nextDouble();
return array;
}
String next() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = read();
} while (!isSpaceChar(c));
return res.toString();
}
String[] nextStringArray(int n) {
String[] array = new String[n];
for (int i = 0; i < n; i++)
array[i] = next();
return array;
}
String nextLine() {
int c = read();
while (isEndline(c))
c = read();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = read();
} while (!isEndline(c));
return res.toString();
}
}
}
fujisu