NCPC26 Practise 3

.idea/.gitignore

@@ -3,8 +3,6 @@
 /workspace.xml
 # Editor-based HTTP Client requests
 /httpRequests/
-# Ignored default folder with query files
-/queries/
 # Datasource local storage ignored files
 /dataSources/
 /dataSources.local.xml

.idea/gradle.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleHome" value="" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="FrameworkDetectionExcludesConfiguration">
+    <file type="web" url="file://$PROJECT_DIR$" />
+  </component>
+  <component name="KubernetesApiProvider"><![CDATA[{}]]></component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="corretto-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

README.md

@@ -1,3 +0,0 @@
-# NCPC26 final practive
-
-This branch contaisn the code from the final practice(18th september 2026) for NCPC26!

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'java'
 }
 
-group = 'com.kattis.ncpc26.pf'
+group = 'org.example'
 version = '1.0-SNAPSHOT'
 
 repositories {
@@ -10,7 +10,7 @@ repositories {
 }
 
 dependencies {
-    testImplementation platform('org.junit:junit-bom:6.0.0')
+    testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Fri Sep 18 10:45:37 CEST 2026
+#Sat Oct 04 11:03:43 CEST 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

java/NCPC26-practive-final/.idea/.gitignore

@@ -1,10 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml
-# Editor-based HTTP Client requests
-/httpRequests/
-# Ignored default folder with query files
-/queries/
-# Datasource local storage ignored files
-/dataSources/
-/dataSources.local.xml

java/NCPC26-practive-final/settings.gradle

@@ -1 +0,0 @@
-rootProject.name = 'NCPC26-practive-final'

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'NCPC-g'

src/main/java/com/kattis/ncpc26/p3/pending/A.java

@@ -0,0 +1,23 @@
+package com.kattis.ncpc26.p3.pending;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Scanner;
+
+public class A {
+    public static void main(String[] args) throws IOException {
+        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+        int num = Integer.parseInt(reader.readLine());
+        String s = reader.readLine();
+        String[] nums = s.split(" ");
+        for(int i = 1; i <= num; i++){
+            if(!(nums[i-1].equals("mumble") || Integer.parseInt(nums[i-1]) == i))
+            {
+                System.out.println("something is fishy");
+                return;
+            }
+        }
+        System.out.println("makes sense");
+    }
+}

src/main/java/com/kattis/ncpc26/p3/pending/B.java

@@ -0,0 +1,112 @@
+package com.kattis.ncpc26.p3.pending;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class B {
+    public static void main(String[] args) throws IOException {
+        Map<Integer, Set<Integer>> exclusiveFollowing = new HashMap<>();
+        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+        String in = reader.readLine();
+        int N = Integer.parseInt(in.split(" ")[0]);
+        int M = Integer.parseInt(in.split(" ")[1]);
+        for(int i = 0; i < M; i++)
+        {
+            in = reader.readLine();
+            int u = Integer.parseInt(in.split(" ")[0]);
+            int v = Integer.parseInt(in.split(" ")[1]);
+            Set<Integer> followings = exclusiveFollowing.getOrDefault(v, new HashSet<>());
+            followings.add(u);
+            exclusiveFollowing.put(v, followings);
+        }
+
+        ArrayList<Pair<Integer, Integer>> sortedFollowings = new ArrayList<>();
+
+        for(Map.Entry<Integer, Set<Integer>> user : exclusiveFollowing.entrySet())
+        {
+            int me = user.getKey();
+            int likesMe = 0;
+            for(int i : user.getValue())
+            {
+                if(!exclusiveFollowing.getOrDefault(i, new HashSet<>()).contains(me))
+                {
+                    likesMe++;
+                }
+            }
+            sortedFollowings.add(new Pair<>(me, likesMe));
+        }
+
+        int mostFollowedUser = 1, followers = 0;
+        for(Pair<Integer, Integer> user : sortedFollowings)
+        {
+            if(user.value > followers)
+            {
+                mostFollowedUser = user.key;
+                followers = user.value;
+            }
+            else if(user.value == followers)
+            {
+                if(user.key < mostFollowedUser)
+                {
+                    mostFollowedUser = user.key;
+                }
+            }
+        }
+        System.out.printf("%d %d", mostFollowedUser, followers);
+    }
+
+    public static class Pair<K, V> {
+        /**
+         * The key of the pair.
+         */
+        private K key;
+        /**
+         * The value of the pair.
+         */
+        private V value;
+
+        /**
+         * Creates a new instance of Pair.
+         * @param key The key of the pair
+         * @param value The value of the pair
+         */
+        public Pair(K key, V value) {
+            this.key = key;
+            this.value = value;
+        }
+
+        /**
+         * Gets the key of the pair.
+         * @return The key of the pair
+         */
+        public K getKey() {
+            return key;
+        }
+
+        /**
+         * Gets the value of the pair.
+         * @return The value of the pair
+         */
+        public V getValue() {
+            return value;
+        }
+
+        /**
+         * Sets the key of the pair.
+         * @param key The key of the pair
+         */
+        public void setKey(K key) {
+            this.key = key;
+        }
+
+        /**
+         * Sets the value of the pair.
+         * @param value The value of the pair
+         */
+        public void setValue(V value) {
+            this.value = value;
+        }
+    }
+}

src/main/java/com/kattis/ncpc26/p3/pending/D.java

@@ -0,0 +1,91 @@
+package com.kattis.ncpc26.p3.pending;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class D {
+    public static void main(String[] args) throws IOException {
+        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+        String in;
+        int num = 0;
+        while(!(in = reader.readLine()).equals("0 0"))
+        {
+            Map<Integer, Set<Integer>> knownNumbers = new HashMap<>();
+            int p = Integer.parseInt(in.split(" ")[0]);
+            int c = Integer.parseInt(in.split(" ")[1]);
+            if(p == 1)
+            {
+                System.out.println("No");
+                continue;
+            }
+            for(int i = 0; i < c; i++)
+            {
+                in = reader.readLine();
+                int a = Integer.parseInt(in.split(" ")[0]);
+                int b = Integer.parseInt(in.split(" ")[1]);
+
+                if(!(a < p || b < p || a == b))
+                {
+                    continue;
+                }
+
+                Set<Integer> numbersKnown = knownNumbers.getOrDefault(a, new HashSet<>());
+                numbersKnown.add(b);
+                knownNumbers.put(a, numbersKnown);
+
+                numbersKnown = knownNumbers.getOrDefault(b, new HashSet<>());
+                numbersKnown.add(a);
+                knownNumbers.put(b, numbersKnown);
+            }
+
+            Set<Integer> reached = new HashSet<>();
+
+            ArrayList<Integer> toTraverse = new ArrayList<>();
+
+            toTraverse.add(0);
+
+            while(!toTraverse.isEmpty())
+            {
+                int node = toTraverse.getFirst();
+                toTraverse.removeFirst();
+                if(reached.contains(node)) continue;
+                knownNumbers.getOrDefault(node, new HashSet<>()).forEach(
+                        (num1) -> {
+                            if(!toTraverse.contains(num1) && !reached.contains(num1))
+                            {
+                                toTraverse.add(num1);
+                            }
+                        }
+                );
+                reached.add(node);
+            }
+
+            if(reached.size() < p)
+            {
+                System.out.println("Yes");
+                continue;
+            }
+
+            boolean prematureExit = false;
+
+            for(Map.Entry<Integer, Set<Integer>> e : knownNumbers.entrySet())
+            {
+                if(e.getValue().size() <= 1)
+                {
+                    System.out.println("Yes");
+                    prematureExit = true;
+                    break;
+                }
+            }
+
+            if(!prematureExit)
+            {
+                System.out.println("No");
+            }
+        }
+    }
+
+}
+