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Commit e38687b

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Merge pull request #347 from GreatAlgorithm-Study/jimin
[26주차] 손지민
2 parents c583b92 + 5e718e2 commit e38687b

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‎BOJ/1000-5000번/JM_2151.java‎

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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.PriorityQueue;
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import java.util.StringTokenizer;
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public class JM_2151 {
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static class Point implements Comparable<Point> {
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int y, x;
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int dir;
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int dist;
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public Point(int y, int x, int dir, int dist) {
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this.y = y;
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this.x = x;
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this.dir = dir;
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this.dist = dist;
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}
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@Override
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public int compareTo(Point o) {
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return this.dist - o.dist;
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}
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}
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static int N;
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static char[][] map;
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static Point start;
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static Point end;
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static final int[][] DIR = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
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private static boolean inRange(int y, int x) {
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return 0 <= y && y < N && 0 <= x && x < N;
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}
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private static int solve() {
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PriorityQueue<Point> pq = new PriorityQueue<>();
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boolean[][][] visited = new boolean[N][N][4];
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for (int i = 0; i < 4; i++) {
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pq.add(new Point(start.y, start.x, i, 0));
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}
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while (!pq.isEmpty()) {
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Point curr = pq.poll();
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visited[curr.y][curr.x][curr.dir] = true;
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if(curr.y == end.y && curr.x == end.x) return curr.dist;
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int ny = curr.y + DIR[curr.dir][0];
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int nx = curr.x + DIR[curr.dir][1];
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if(!inRange(ny, nx) || map[ny][nx] == '*' || visited[ny][nx][curr.dir]) continue;
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if(map[ny][nx] == '!') {
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pq.add(new Point(ny, nx, (curr.dir + 1) % 4, curr.dist + 1));
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pq.add(new Point(ny, nx, (curr.dir + 3) % 4, curr.dist + 1));
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}
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pq.add(new Point(ny, nx, curr.dir, curr.dist));
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}
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return -1;
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}
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public static void main(String[] args) throws IOException {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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StringTokenizer st = new StringTokenizer(br.readLine());
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N = Integer.parseInt(st.nextToken());
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map = new char[N][N];
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for (int i = 0; i < N; i++) {
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map[i] = br.readLine().toCharArray();
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for (int j = 0; j < N; j++) {
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if(map[i][j] == '#') {
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if(start == null) start = new Point(i, j, -1, 0);
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else end = new Point(i, j, -1, 0);
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}
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}
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}
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System.out.println(solve());
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}
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}

‎BOJ/1000-5000번/JM_3151.java‎

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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.Arrays;
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import java.util.StringTokenizer;
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public class JM_3151 {
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static int N;
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static int[] A;
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private static int lowerBound(int startIndex, int target) {
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int lo = startIndex, hi = N - 1;
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int ans = N;
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while (lo <= hi){
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int mid = (lo + hi) / 2;
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if(target <= A[mid]) {
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ans = mid;
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hi = mid - 1;
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}
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else lo = mid + 1;
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}
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return ans;
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}
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private static int upperBound(int startIndex, int target) {
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int lo = startIndex, hi = N - 1;
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int ans = N;
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while (lo <= hi){
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int mid = (lo + hi) / 2;
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if(target < A[mid]) {
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ans = mid;
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hi = mid - 1;
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}
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else lo = mid + 1;
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}
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return ans;
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}
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private static long solve() {
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Arrays.sort(A);
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long count = 0;
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for (int i = 0; i < N; i++) {
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for (int j = i + 1; j < N; j++) {
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int target = 0 - (A[i] + A[j]);
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int lowerIndex = lowerBound(j + 1, target);
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int upperIndex = upperBound(j + 1, target);
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count += upperIndex - lowerIndex;
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}
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}
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return count;
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}
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public static void main(String[] args) throws IOException {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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StringTokenizer st = new StringTokenizer(br.readLine());
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N = Integer.parseInt(st.nextToken());
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A = new int[N];
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st = new StringTokenizer(br.readLine());
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for(int i = 0; i < N; i++) {
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A[i] = Integer.parseInt(st.nextToken());
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}
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System.out.println(solve());
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}
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}
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.Arrays;
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import java.util.StringTokenizer;
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public class JM_코드트리_메신저 {
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static class Room {
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int c;
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boolean alert;
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int authority;
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int parent;
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int leftChild;
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int rightChild;
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int[] effect;
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public Room(int c) {
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this.c = c;
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this.alert = true;
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this.parent = -1;
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this.leftChild = -1;
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this.rightChild = -1;
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this.effect = new int[DEPTH + 1];
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}
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public void toggleAlert() {
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this.alert = !this.alert;
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}
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}
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static int N;
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static int Q;
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static Room[] rooms;
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static final int DEPTH = 20;
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private static void update(int c) {
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while (c != 0) {
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Room curr = rooms[c];
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Arrays.fill(curr.effect, 0);
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for (int i = 0; i <= curr.authority; i++) {
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rooms[c].effect[i]++;
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}
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if(curr.leftChild != -1 && rooms[curr.leftChild].alert) {
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for (int i = 1; i <= DEPTH; i++) {
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curr.effect[i - 1] += rooms[curr.leftChild].effect[i];
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}
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}
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if(curr.rightChild != -1 && rooms[curr.rightChild].alert) {
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for (int i = 1; i <= DEPTH; i++) {
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curr.effect[i - 1] += rooms[curr.rightChild].effect[i];
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}
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}
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c = rooms[c].parent;
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}
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}
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private static void swapParent(int c1, int c2) {
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int p1 = rooms[c1].parent;
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int p2 = rooms[c2].parent;
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if(rooms[p1].leftChild == c1) {
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rooms[p1].leftChild = c2;
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} else if(rooms[p1].rightChild == c1) {
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rooms[p1].rightChild = c2;
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}
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if(rooms[p2].leftChild == c2) {
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rooms[p2].leftChild = c1;
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} else if(rooms[p2].rightChild == c2) {
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rooms[p2].rightChild = c1;
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}
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rooms[c1].parent = p2;
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rooms[c2].parent = p1;
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update(c1);
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update(c2);
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}
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private static void changeAuthority(int c, int power) {
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rooms[c].authority = power > DEPTH ? DEPTH : power;
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update(c);
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}
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private static void toggleNotification(int c) {
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rooms[c].toggleAlert();
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update(c);
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}
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private static void initEffect(int c) {
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if(c == -1) return;
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Room curr = rooms[c];
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for (int i = 0; i <= curr.authority; i++) {
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rooms[c].effect[i]++;
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}
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initEffect(curr.leftChild);
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initEffect(curr.rightChild);
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if(curr.leftChild != -1) {
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for (int i = 1; i <= DEPTH; i++) {
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curr.effect[i - 1] += rooms[curr.leftChild].effect[i];
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}
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}
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if(curr.rightChild != -1) {
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for (int i = 1; i <= DEPTH; i++) {
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curr.effect[i - 1] += rooms[curr.rightChild].effect[i];
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}
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}
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}
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private static void init(StringTokenizer st) {
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rooms = new Room[N + 1];
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for (int i = 0; i <= N; i++) {
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rooms[i] = new Room(i);
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}
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for (int i = 1; i <= N; i++) {
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int pIdx = Integer.parseInt(st.nextToken());
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rooms[i].parent = pIdx;
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if(rooms[pIdx].leftChild == -1) rooms[pIdx].leftChild = i;
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else rooms[pIdx].rightChild = i;
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}
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for (int i = 1; i <= N; i++) {
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rooms[i].authority = Integer.parseInt(st.nextToken());
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if(rooms[i].authority > DEPTH) rooms[i].authority = DEPTH;
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}
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initEffect(0);
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}
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public static void main(String[] args) throws IOException {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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StringTokenizer st = new StringTokenizer(br.readLine());
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N = Integer.parseInt(st.nextToken());
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Q = Integer.parseInt(st.nextToken());
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StringBuilder sb = new StringBuilder();
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int c;
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while (Q-- > 0) {
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st = new StringTokenizer(br.readLine());
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int command = Integer.parseInt(st.nextToken());
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switch (command) {
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case 100: // 사내 메신저 준비
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init(st);
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break;
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case 200: // 알림망 설정 (ON/OFF)
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c = Integer.parseInt(st.nextToken());
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toggleNotification(c);
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break;
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case 300: // 권한 세기 변경
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c = Integer.parseInt(st.nextToken());
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int power = Integer.parseInt(st.nextToken());
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changeAuthority(c, power);
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break;
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case 400: // 부모 채팅방 교환
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int c1 = Integer.parseInt(st.nextToken());
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int c2 = Integer.parseInt(st.nextToken());
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swapParent(c1, c2);
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break;
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case 500: // 알림을 받을 수 있는 채팅방 수 조회
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c = Integer.parseInt(st.nextToken());
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sb.append(rooms[c].effect[0] - 1).append("\n");
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break;
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}
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}
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System.out.println(sb);
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}
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}

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