[20250305] BOJ / P5 / 박성원 / 권혁준

Author: oncsr

khj20006/202503/05 BOJ P5 박성원.md

@@ -0,0 +1,97 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+class Main {
+	
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+	
+	// Additional field
+
+	static long[][] dp;
+	static int N, K;
+	static int[] len, A;
+	static char[][] temp;
+	static long[] pre;
+	
+	public static void main(String[] args) throws Exception {
+		
+		ready();
+		solve();
+	
+		bwEnd();
+		
+	}
+	
+	static void ready() throws Exception{
+
+		N = Integer.parseInt(br.readLine());
+		temp = new char[N][];
+		for(int i=0;i<N;i++) temp[i] = br.readLine().toCharArray();
+		K = Integer.parseInt(br.readLine());
+		dp = new long[K][1<<N];
+		len = new int[N];
+		A = new int[N];
+		pre = new long[16];
+		pre[1] = 10;
+		for(int i=2;i<16;i++) pre[i] = pre[i-1] * 10;
+		
+		for(int i=0;i<N;i++) {
+			len[i] = temp[i].length;
+			int res = 0;
+			for(char c : temp[i]) {
+				res = (res * 10 + (c-'0')) % K;
+			}
+			A[i] = res;
+			dp[res][1<<i] = 1;
+		}
+		
+	}
+	
+	static void solve() throws Exception{
+
+		for(int i=1;i<(1<<N);i++) {
+			for(int k=0;k<K;k++) {
+				for(int x=0;x<N;x++) if((i & (1<<x)) == 0) {
+					long tmp = k;
+					int cnt = len[x];
+					while(cnt > 0) {
+						int diff = Math.min(15, cnt);
+						tmp = (tmp * pre[diff]) % K;
+						cnt-=diff;
+					}
+					int res = ((int)tmp + A[x]) % K;
+					dp[res][i|(1<<x)] += dp[k][i];
+				}
+			}
+		}
+		
+		long ans = dp[0][(1<<N)-1], total = 1;
+		for(long i=2;i<=N;i++) total *= i;
+		
+		if(ans == 0) total = 1;
+		else {
+			long[] P = {2,3,5,7,11,13};
+			for(long i:P) {
+				while(ans%i==0 && total%i==0) {
+					ans/=i;
+					total/=i;
+				}
+			}
+		}
+		bw.write(ans+"/"+total);
+		
+	}
+	
+}
+
+```