• 문제 링크
https://www.acmicpc.net/problem/31884
• 풀이 코드
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;
public class Main {
static Map<Integer, Integer> map = new HashMap<>();
public static void main(String[] args) throws IOException {
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
StringBuilder sb = new StringBuilder();
int Q = read();
while (Q-- > 0) {
int q = read();
if (q == 1) hrz(read());
else if (q == 2) vrt(read());
else sb.append(map.getOrDefault(read(), 0)).append("\n");
}
bw.write(sb.toString());
bw.flush();
}
private static void hrz(int i) {
int max = 0;
for (int j = i + 3; j >= i; j--) max = Math.max(max, map.getOrDefault(j, 0));
for (int j = i + 3; j >= i; j--) map.put(j, max + 1);
}
private static void vrt(int i) {
map.put(i, map.getOrDefault(i, 0) + 4);
}
private static int read() throws IOException {
int c, n = System.in.read() & 15;
boolean flag = n == 13;
if (flag) n = System.in.read() & 15;
while ((c = System.in.read()) > 32) n = (n << 3) + (n << 1) + (c & 15);
return flag ? ~n + 1 : n;
}
}
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