[20250321] BOJ / G3 / Painting the Fence / 권혁준

khj20006/202503/21 BOJ G3 Painting the Fence.md

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+```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 = new StringTokenizer("");
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static String nextToken() throws Exception {
+		while(!st.hasMoreTokens()) nextLine();
+		return st.nextToken();
+	}
+	static int nextInt() throws Exception { return Integer.parseInt(nextToken()); }
+	static long nextLong() throws Exception { return Long.parseLong(nextToken()); }
+	static double nextDouble() throws Exception { return Double.parseDouble(nextToken()); }
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+
+	// Additional field
+
+	static int N;
+	static PriorityQueue<int[]> Q = new PriorityQueue<>((a,b) -> {
+		if(a[0] == b[0]) return b[1]-a[1];
+		return a[0]-b[0];
+	});
+
+	public static void main(String[] args) throws Exception {
+
+		ready();
+		solve();
+
+		bwEnd();
+
+	}
+
+	static void ready() throws Exception{
+
+		N = nextInt();
+		int cur = 0;
+		for(int i=0;i<N;i++) {
+			int len = nextInt();
+			char a = nextToken().charAt(0);
+			if(a == 'L') len *= -1;
+			int next = cur + len;
+			Q.offer(new int[] {Math.min(cur, next),1});
+			Q.offer(new int[] {Math.max(cur, next),-1});
+			cur = next;
+		}
+
+	}
+
+	static void solve() throws Exception{
+
+		int ans = 0, cnt = 0;
+
+		int prev = 0;
+		while(!Q.isEmpty()) {
+			int now = Q.peek()[0];
+			if(cnt > 1) ans += now - prev;
+			while(!Q.isEmpty() && Q.peek()[0] == now) cnt += Q.poll()[1];
+			prev = now;
+		}
+		bw.write(ans + "\n");
+
+	}
+
+}
+
+```