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_9184.java
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74 lines (62 loc) ยท 1.88 KB
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package backjoon;
// https://www.acmicpc.net/problem/9184
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class _9184 {
// ํจ์ w๋ 0์ดํ๋ 1์ ํธ์ถํ๊ณ 20์ด์์ 20์ ํธ์ถํ๊ธฐ๋๋ฌธ์ ๊ธธ์ด๋ 21๋ก ์ค์
static int[][][] dp = new int[21][21][21];
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringBuilder sb = new StringBuilder();
// memory 24808 runtime 228
while(true) {
StringTokenizer st = new StringTokenizer(br.readLine(), " ");
int a = Integer.parseInt(st.nextToken());
int b = Integer.parseInt(st.nextToken());
int c = Integer.parseInt(st.nextToken());
// -1 -1 -1 ์ด ๋์ค๋ฉด ์ข
๋ฃ
if (a == -1 && b == -1 && c == -1) {
break;
}
sb.append("w(" + a + ", " + b + ", " + c + ") = ").append(w(a ,b ,c)).append('\n');
}
System.out.println(sb);
}
static int w(int a, int b, int c) {
// ์ด๋ฏธ ์ ์ฅ๋์ด์๋ ๊ฐ์ ๊ทธ๋๋ก ํธ์ถ
if(inRange(a, b, c) && dp[a][b][c] != 0) {
return dp[a][b][c];
}
if(a <= 0 || b <= 0 || c <= 0) {
return 1;
}
if(a > 20 || b > 20 || c > 20) {
return dp[20][20][20] = w(20, 20, 20);
}
if(a < b && b < c) {
return dp[a][b][c] = w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c);
}
return dp[a][b][c] = w(a - 1, b, c) + w(a - 1, b - 1, c) + w(a - 1, b, c - 1) - w(a - 1, b - 1, c - 1);
}
// a,b,c์ ๋ฒ์๊ฐ 0 ~ 20 ์ฌ์ด์ธ์ง ์ฒดํฌ
static boolean inRange(int a, int b, int c) {
return 0 <= a && a <= 20 && 0 <= b && b <= 20 && 0 <= c && c <= 20;
}
}
/*
input
1 1 1
2 2 2
10 4 6
50 50 50
-1 7 18
-1 -1 -1
output
w(1, 1, 1) = 2
w(2, 2, 2) = 4
w(10, 4, 6) = 523
w(50, 50, 50) = 1048576
w(-1, 7, 18) = 1
*/